6.5cm Precision AR10 Build/Info

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padom

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6.5cm AR10 Precision Build
09/25/2015 Last edited 09/26/2015 by padom

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So I've built many very accurate AR15's with WOA barrels ranging from 10.5" to 20". I sold my POF P308 14.5" a few months back. I had custom 6.5cm and .260Rem bolt guns built this year and they are extremely accurate. I am missing my AR10 but I got out of the .308 game. I sold off all brass, dies, and reloding materials for 308 in favor of 6.5 calibers. With match 6.5cm ammo costing the same or less than .308 match ammo and 6.5 shooting flatter and softer I have decided to fill the AR10 hole in my safe with a 6.5cm AR10. I thought about GAP and JP but I like building AR's and wanted to build one with the exact components I wanted.

So here we go, I bought the following parts

AeroPrecision 308 M5 receiver set (upper and lower)
Magpul PRS stock
Rifle length buffer tube
JP rifle length buffer spring
Rifle length buffer
BAD Ambi Safety
Ergo Tactical Deluxe Grip
Geissele SSA-E
BCM Mod 3 Charging Handle
Silencerco 308 5.8x24 brake
JP Enterprises Large Frame LMOS Bolt Carrier with QPQ Finish
JP Enterprises HP Bolt Assembly .308 High Pressure with Custom Firing Pin - DPMS Pattern
Syrac Gen II - .936" Adjustable Low Pro Clamp-On Gas Block - Melonite Finish
Fortis SWITCH .308 Rail System - 15" - DPMS High Profile
Seekins Precision Melonited Rifle Length Gas Tube

Lastly I have John Scandale at Keystone Accuracy making the barrel. Its a Bartlein 6.5mm SS 5R 8twist with a BAT barrel extension chambered in 6.5cm and headspaced to my JP bolt. I will be finished at 20" with a threaded muzzle and the Silencerco brake installed and timed.

I plan to shoot the large stock of 123 Lapua Scenars and 123 Amax's I have out of this gun. Will also be testing the 130 Hybrids.

Should have the gun together and ready for testing in the next 3-4 weeks.

Stay tuned.....
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ssdrewX29 MONTHS
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Re: 6.5cm AR10 Precision Build
09/26/2015

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I will be following along. I have gone back and forth over the past year if i wanted to step up to building an AR10 platform rifle. Always loved the idea of a 6.5cm in a gas gun. Love me some WOA barrels as well.

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EricF517XGunny Sergeant
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Re: 6.5cm AR10 Precision Build
09/26/2015
(1 vote)

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Have Josh over at Patriot Arms spin you up one?

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
09/26/2015

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EricF517 wrote:
Have Josh over at Patriot Arms spin you up one?​

Huh?
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EricF517XGunny Sergeant
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Re: 6.5cm AR10 Precision Build
09/26/2015

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I have been talking to Josh about a possible AR10 build. He offered to make up a Hawk Hill barrel for me out of a blank.

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
09/26/2015 Last edited 09/26/2015 by padom

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I already have John at Keystone Accuracy spinning me up a Bartlein as noted in the OP. He's local to me, only 15-20min away and comes highly recommended by my bolt action gunsmith along with a few local skilled and knowledgeable competition shooters. I've also received PM's from fellow Hide members stating Keystone Accuracy is a great choice.
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padom

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Re: 6.5cm AR10 Precision Build
09/30/2015 Last edited 09/30/2015 by padom

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Decided to have Keystone Accuracy flute the barrel as well. Getting 8 straight flutes both before and after the gas block. Should look great and reduce the overall weight of my AR10.
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wjm308

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Re: 6.5cm AR10 Precision Build
09/30/2015

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I was so tempted to do a 6.5 barrel with my build but ended up staying with 308. I love the idea of the 6.5CM in a gas gun and will anxiously await to hear how it shoots in the end.

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padom

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Re: 6.5cm AR10 Precision Build
09/30/2015 Last edited 09/30/2015 by padom

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I got out of the 308 game in favor of the .264 calibers. I sold off all my brass, dies, bolt guns and my POF P308 AR10. After having both a 6.5cm and .260Rem built this year I wanted another AR10 in 6.5cm due to the fact that I can shoot factory match grade ammo that is the same cost or cheaper than 308 match and is readily available. I reload but wanted the option to shoot factory ammo need be. There is some good .260rem factory match ammo out there but its expensive and not as widely available as Hornady 6.5cm.

When I first decided to do this build I was dead set on a Mega receiver set. I happened to stumble on the AeroPrecision LR-308 upper and lower receiver sale at Brownell's and decided to give them a try. I was nervous but I use AeroPrecision AR15 receivers for all my AR15's and they have been great. I was nervous but I picked the set up from my FFL yesterday and I have to say I'm really impressed. Especially for the price. I got the set on sale (not blems) from Brownells for $260.00. The fit and finish are perfect.

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bigjake83XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/01/2015

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Everything looks good Sir... if you haven't already bought the PRS I would recommend the Luth stock, and I would STRONGLY advise you have the face of the receiver trued.

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padom

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Re: 6.5cm AR10 Precision Build
10/01/2015

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I already bought all the parts including the PRS.

I will talk to John at Keystone about truing the receiver when I pick up the barrel.
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wjm308

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Re: 6.5cm AR10 Precision Build
10/01/2015

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$260 for a large frame upper/lower combo... I understand why you did not pass that up, I have always been curious about Aero quality.

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KamkazeXGunny Sergeant
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Re: 6.5cm AR10 Precision Build
10/02/2015

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Good stuff I just picked up a 6.5 creedmoor ar built on an aero matched set im interested in seeing yours when it's done.

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/02/2015 Last edited 10/02/2015 by padom

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All my parts arrived yesterday. Dropping the brake, bolt, gas block, gas tube and 6.5cm reamer off to Keystone today so they can spin up my Bartlein.
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allamerican2000XPrivate
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Re: 6.5cm AR10 Precision Build
10/03/2015
(1 vote)

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Great Minds. I went down the exact same path you are. I started with a Broughton blank turned by Craddock Precision. I have only had it out once, for 20 rds of function testing. I used factory Hornady match 120gr Amax. Functioned beautifully, and initial groups are very promising. I am yet to attach a muzzle device. I want a Thunderbeast down the road, but not sure what to affix in the mean time.

22" Broughton

SLR Rifleworks rail

SLR adjustable gas block

Aero Matched upper and lower

Aero BCG

Geissele Hi-Speed Match trigger

Larue SPR Grip

BAD ambi short throw safety

Magpul PRS stock

JP Silent capture spring

Bushnell XRS 4.5-30x50 in Badger unimount

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DavidDSAR10X253 MONTHS
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Re: 6.5cm AR10 Precision Build
10/03/2015 Last edited 10/03/2015 by DavidDSAR10

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bigjake83 wrote:
Everything looks good Sir... if you haven't already bought the PRS I would recommend the Luth stock, and I would STRONGLY advise you have the face of the receiver trued.​

AeroPrecision has never needed their nose wiped by anyone.

EDIT: Sorry, BJ. I meant to convey that AP never needed the face trued compared to all the other problems that they have let out the door...

so maybe, instead of a nose wiping, an ass whoopin' is in order?

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dcl1bowXPrivate
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Re: 6.5cm AR10 Precision Build
10/04/2015

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You guys are killing me!! I've been trying to avoid the 6.5 AR thing. But reading this is making it too tempting. Going to start ordering parts today. Only hang-up is the barrel. If you don't mind. What should I expect to pay to have a Bartlien or Broughton barrel put together? I hate being nosey. Just wondering how deep into the fun budget I'll be digging. Thanks. DCL.

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padom

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Re: 6.5cm AR10 Precision Build
10/04/2015 Last edited 10/04/2015 by padom

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Look to pay between $600-$650 for a Bartlein with threaded/timed muzzle brake and BAT barrel extension. Fluting will push you into the $700-$750 range depending on how many flutes and where you want them. I added 8 straight flutes to my barrel both before and after the gas block.

I dropped my 6.5cm reamer, gas block and muzzle brake off to Keystone Accuracy on Friday. Should be able to pick up the finish barrel in 2.5 weeks. I have everything else sitting on the bench. Lower is assembled, just need the slip the barrel in, torque the barrel nut and install the Fortis handguard.
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allamerican2000XPrivate
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Re: 6.5cm AR10 Precision Build
10/04/2015

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dcl1bow wrote:
You guys are killing me!! I've been trying to avoid the 6.5 AR thing. But reading this is making it too tempting. Going to start ordering parts today. Only hang-up is the barrel. If you don't mind. What should I expect to pay to have a Bartlien or Broughton barrel put together? I hate being nosey. Just wondering how deep into the fun budget I'll be digging. Thanks. DCL.​

My Broughton all in was $520. I got a great deal on one my friend had sitting on the bench.

 

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sheepdog697

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Re: 6.5cm AR10 Precision Build
10/04/2015

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Following along as well. I'd love to do a similar build

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padom

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Re: 6.5cm AR10 Precision Build
10/05/2015 Last edited 10/05/2015 by padom

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Everything is assembled and ready to go, just waiting on the barrel which won't be here for another 2 weeks.

I went with the Grey PRS stock because the plan is to have the upper/lower receiver and Fortis rail cerakoted Snipers Grey. Not sure if I'm going to do the barrel in Graphite Black or Burnt Bronze.

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sheepdog697

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Re: 6.5cm AR10 Precision Build
10/05/2015

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That looks awesome in the grey. Nice looking work bench too!

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speedneoX48 MONTHS
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Re: 6.5cm AR10 Precision Build
10/07/2015

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Nice setup， sir. I am new to AR10. I have a stupid question. In order to put a Bartlein barrel into a AR10 upper, we must to use barrel extension? Thanks

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padom

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Re: 6.5cm AR10 Precision Build
10/07/2015

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Yes it needs a barrel extension. My smith is installing a BAT barrel extension.
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speedneoX48 MONTHS
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Re: 6.5cm AR10 Precision Build
10/07/2015

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What kind contour for your barrel?

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bigjake83XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/07/2015

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padom wrote: Yes it needs a barrel extension. My smith is installing a BAT barrel extension.​

Is there a certain reason why you chose the bat barrel extension??

Did you take a look at the JP barrel extension ?? My next Big Block will have one they made it more reliable and really smooth.

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/07/2015

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Because thats what my smith thats spinning up the barrel uses.
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padom

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Re: 6.5cm AR10 Precision Build
10/08/2015 Last edited 10/08/2015 by padom

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I'm not sure what barrel contour my smith is using. He told me it will be 1" under the handguard, .936" gas tenon and .875" forward of gas block. There will be 8 straight flutes both before gas block under handguard and after gas block to muzzle.
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MOJAVENINERXCorporal
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Re: 6.5cm AR10 Precision Build
10/09/2015

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Very interested in your build. I've been toying with the idea of a 6.5 Creedmoor AR for a while. I thought at first of buying an S&W M&P 10 and then replacing the barrel, but learned that they use proprietary stuff, so its not that easy as having a barrel chambered/drilled for you, or buying an already chambered barrel from Criterion. Plus I'd want a different stock, handguard, trigger, etc, so I think a custom route would be better. The problem I then run into is cost...seems like these builds are pricey. What is your build going to tally up to? That's a good deal on the Aero precision upper/lower receiver set. I'd be interested to see how much play there is once the upper is completed, how you end up tuning your gas system, and of course let us know how she shoots. Please keep us posted.

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padom

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Re: 6.5cm AR10 Precision Build
10/09/2015 Last edited 10/09/2015 by padom

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Total cost will be right around $2600. Theres zero play between the upper and lower. Its all put together. Putting the barrel on it wont all of a sudden add play. The M5 receiver set comes with a tensioning screw if you do experience play also.

 

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allamerican2000XPrivate
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Re: 6.5cm AR10 Precision Build
10/10/2015

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The total for mine is $2500, but I still need a muzzle brake.

Aero Set	286
PRS	200
Lower Parts	14.87
Larue A-PEG	21.95
Geissele Hi-Speed DMR	270
Barrel	520
BCG Aero	169.99
Bolt	0
Rail, SLR solo	290
BCM CH	52.14
Bad ASS STS	92.95
JP Silent Capture Spring	140
adj gas block, SLR	120
Muzzle Break
Multicam Dip	280
Cerakote	50
Total	2507.9

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yessotXPrivate
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Re: 6.5cm AR10 Precision Build
10/11/2015 Last edited 10/11/2015 by yessot

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I ran and Aero M5 last year with a 6.5 CM barrel from JP Rifles for the 2014 season. JP modular hand guard, JP adj gas block, JP brake, JP low mass BCG, JP SCB, Geissele DMR FCG, BAD ambi, Magpul PRS stock. The gun shot better than .5" groups running box 140 AMAX. Sold it at the end of the season.

I built an Aero M5E 6.5 CM for the 2015 season. It has the 15" keymod hand guard, 22" JP barrel with matched bolt, JP brake, Syrac adj gas block, NIB BC, Elftmann match trigger, BAD ambi safety, Luth-AR MBA, and JP tungsten SCB. Damned thing shoots as well as last years' did with the same box 140 AMAX. Season ended with injury. I have appr 400 down the tube. Putting it for sale for $2200

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padom

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Re: 6.5cm AR10 Precision Build
10/21/2015

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Just got a message that my barrel is done. Hope to pick it up in the next day or two so I can get it on the range. Stay tuned...

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Bullzeye260

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Re: 6.5cm AR10 Precision Build
10/21/2015

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Awesome rig, Padom. I shoot .260 out of my AR and it is a great time. My only reluctance from buying it is because I never shoot my bolt gun anymore!!! I don't know what the hell it is, but in these PR competitions, shooting an AR just increases the fun factor for me several times over. Could be because I shot them for so long with my bolt and running the AR is just something different. I'm sure you're going to have a good time with that one.

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padom

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Re: 6.5cm AR10 Precision Build
10/22/2015

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Picked my barrel up this morning and it looks great. Just got it installed. Have a box or two of factory Hornady 140amax to run through it to get gas block tuned. Will load up a 123scenar OCW test tonight for it. Hope to get to the range tomorrow to test her out.

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LtdshooterXSergeant
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Re: 6.5cm AR10 Precision Build
10/22/2015

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Nice contour on the barrel. If you have time can you post the dimensions? I'm interested in having one spun up...

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/22/2015 Last edited 10/22/2015 by padom

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What dimensions are you looking for? Its 22" 1:8 Bartlein on a BAT barrel extension, 1" under handguard, .936 gas tenon, .875" forward of gas block, 5/8x24 threads, 6 straight 3/16 flutes before and after gas block.

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padom

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Re: 6.5cm AR10 Precision Build
10/22/2015

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Scoped mounted and 123 Scenar OCW is loaded up. Hope to get to the range tomorrow

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LtdshooterXSergeant
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Re: 6.5cm AR10 Precision Build
10/23/2015

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That works, thanks!

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padom

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Re: 6.5cm AR10 Precision Build
10/23/2015

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Got to the range today. Accuracy is excellent. Shot 20rd of factory 140amax to adjust gas block and sight in.

123 scenar / H4831sc OCW went well. 2 groups were just under .40". Will post pics when I get home.

Im extremely happy with it, performs flawlessly as expected.
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bigjake83XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/23/2015 Last edited 10/23/2015 by bigjake83

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Congrats Sir I'm happy you got yourself a shooter, this is a perfect example of why I always tell people to start with a quality barrel, for the love of God I have no idea why people spend $600 on a Rainier barrels. Could you please give me some detailed insight on how good the Fortis Switch handguard are, are they rock solid??....thanks

PS. Are you going to try out the Berger 140 hybrids??? Or did you Chamber your barrel more towards the 123??

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/23/2015 Last edited 10/23/2015 by padom

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Yea the barrel wasnt cheap but I could have got it down to $640 if i didnt add the 6 flutes. I think they look great and reduce weight at the same time. I have no regrets.

I have a 260rem and 6.5cm bolt so I plan to save the 139/140 bullets and H4350 for them.

While my new semi will shoot the heavies my goal was to use up the 15lbs of H4831sc and Varget with the thousands of 123's I have sitting here. Seems Im well on my way.

The Fortis handgaurd is rock solid. I have the barrel nut that came with it installed and it is locked up tight. I also bought the Fortis anti rotation barrel nut but didnt install it as of yet. We will see if its necessary as time goes on but it was rock solid today. I love how light it is, weighs nothing.
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KamkazeXGunny Sergeant
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Re: 6.5cm AR10 Precision Build
10/23/2015

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Great build

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
10/24/2015 Last edited 10/24/2015 by padom
(1 vote)

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I laser bore sighted the gun then fine tuned elevation and adjusted the gas block with factory Hornady 140 amax (20rds) on the target below. Still needs to come to the right a little bit but didn't care because I will fine tune my zero with the final 123 Scenar OCW load.

I then let the gun cool down and shot my 123 Lapua Scenar / H4831sc OCW test. Bullets are seated .03 off the lands which is the longest I can go in these PMAG M118 mags. I need to find a KAC 10rd mag as the long M118 25rd mag makes load development difficult because its so long. 45.6 is slightly compressed but I have zero pressure signs, no flattened primers or ejector swipes. Gonna get the Magnetospeed V3 out to check speed next trip. H4831sc is very accurate from past experience but slower than H4350. If speed is slower than I want with H4831sc I will do an OCW with Varget since I have plenty of it and got out of the 308 game. I have over 16lbs of H4350 but with a 6.5cm and .260Rem bolt gun I wanted to use up either Varget and/or H4831sc for this semi with the lighter bullets.

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sevenmmXGunny Sergeant
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Re: 6.5cm AR10 Precision Build
11/12/2015

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Any updates on this? What are you getting for speed?



Thanks

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padom

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Re: 6.5cm AR10 Precision Build
11/12/2015

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Ive been tied up with a new house purchase, completely gutted it and putting it all back together. Trying to get moved in within the next 2-3 weeks so time with the new semi has been limited.

I went up to 46g in charge weight with H4831sc/123 Scenar and its shooting in the .2's at 100. That was only the 2nd and last time i shot it. Magnetospeed V3 had 46g h4831sc at 2730
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sheepdog697

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Re: 6.5cm AR10 Precision Build
11/17/2015

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awesome results. Wish i had the money to build something similar.

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wjm308

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Re: 6.5cm AR10 Precision Build
11/17/2015 Last edited 11/17/2015 by wjm308

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Sweet setup padom, I really like how it all came together. The Bartlein barrel Keystone did for you looks great and obviously shoots great, I hope to get my rifle back from PROOF Research soon and be putting in some nice tight groups. What you've shown here is that you can build an AR-10 style rifle with Aero Precision upper/lower and still get fantastic precision. You mentioned getting .2" groups at 100 yards which is crazy good. How is the clearance of the SLR Sentry 9 gas block inside the Fortis Switchrail? Also, did John install the barrel for you and did he true the upper receiver at all?

Your results also prove that you can get great accuracy from the JP LMOS and SRS system while not using other JP parts. Did you give John at Keystone your bolt to have him headspace to the barrel?

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padom

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Re: 6.5cm AR10 Precision Build
11/18/2015 Last edited 11/18/2015 by padom

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I dont have an SLR, I have a Syrac Gen2 and clearance is fine. John custom made the Bartlein and installed it on a BAT barrel extension. I installed the barrel on my receiver and torqued the nut to Fortis specs using my torque wrench and the Fortis barrel nut wrench. I asked John about truing the receiver and he. laughed. He said its a joke and receivers made nowadays dont require trueing. His reputation stands for itself so I passed and the results have been great.

Yes, John required i give him my JP bolt so he could headspace it to the barrel. I gave John my 6.5cm reamer as well to chamber my barrel.
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Gryph8nXFirst Sergeant
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Re: 6.5cm AR10 Precision Build
11/28/2015

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I feel your pain. I had to send back my Proof Research barrel too and am still waiting to get it back.
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JigStick

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Re: 6.5cm AR10 Precision Build
12/10/2015

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Glad I found this thread. Im getting ready to place an order from Mega for a ambi billet upper/lower receiver set.

Recently I have been coming across a lot of posts all over the internet saying that getting the 6.5cm to cycle right in a gas gun is a PITA. It doesn't seem like you are having any problems. I think it was mostly with 140g pills…something about cratered primers and pressure issues on the brass.

Have you shot yours suppressed?
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Gryph8nXFirst Sergeant
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Re: 6.5cm AR10 Precision Build
12/10/2015

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Reliable cycling and extraction is not a problem with a custom 6.5 creedmoor AR if you have an adjustable gas block and your chamber is headspaced correctly. 140grs in factory ammo can have overpressure problems but if you hand load, you can get them to shoot as well. 120-130gr tend to be more gentle on your brass.
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padom

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Re: 6.5cm AR10 Precision Build
12/10/2015

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I shot 2 boxes of Factory Hornady Match 140 Amax ammo through the gun before testing my handloads. They cycled perfectly and were extremely accurate.

I went with the JP HP bolt enhanced bolt as well.

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lte82XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
12/10/2015

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Nice rifle. I have a couple of barrels from John as well, both are shooters.

But I have to ask, why 4831sc?

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
12/10/2015

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Because I have an 8b jug of it and wanted to use it up. I have plentynof H4350 for my 6.5cm and 260rem bolt guns but wanted to play with H4831sc and 123's. I will probably work up some H4350 for it eventually.

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southpaw68X171 MONTHS
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Re: 6.5cm AR10 Precision Build
12/10/2015

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I got really lucky with my 6.5 CM build. I got an SLR adjustable gas block and the JP captured buffer spring with variable spring weights in preparation for having to make adjustments. I set the gas block to the middle, used the middle spring weight and it has functioned flawlessly with everything I have fed it so far. 120gr to 142gr stuff. I have yet to make an adjustment. I would most likely have still bought the same stuff so no regrets there, but I'm glad I haven't had to spent extra rounds tuning out issues.

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LhotseXPrivate
Rating: 3.0/5 this site
19 posts this site
Re: 6.5cm AR10 Precision Build
12/14/2015

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Nice build - would love to hear about your latest range trips when you get a chance (I'm in the process of buying a new house, too, so I have an idea of the time suck it represents). Working on my own M5 build and trying to decide on barrels. I was thinking JP matched bolt and barrel, but there are a lot of good choices out there, it seems.

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LhotseXPrivate
Rating: 3.0/5 this site
19 posts this site
Re: 6.5cm AR10 Precision Build
12/14/2015

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Nice build - would love to hear about your latest range trips when you get a chance (I'm in the process of buying a new house, too, so I have an idea of the time suck it represents). Working on my own M5 build and trying to decide on barrels. I was thinking JP matched bolt and barrel, but there are a lot of good choices out there, it seems.

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wjm308

XFirst Sergeant
Rating: 3.6/5 this site
2359 posts this site
Re: 6.5cm AR10 Precision Build
12/14/2015 Last edited 12/14/2015 by wjm308

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southpaw68 wrote:
I got really lucky with my 6.5 CM build. I got an SLR adjustable gas block and the JP captured buffer spring with variable spring weights in preparation for having to make adjustments. I set the gas block to the middle, used the middle spring weight and it has functioned flawlessly with everything I have fed it so far. 120gr to 142gr stuff. I have yet to make an adjustment. I would most likely have still bought the same stuff so no regrets there, but I'm glad I haven't had to spent extra rounds tuning out issues.​

Southpaw68, this is not really the best use case of an adjustable gas block. I realize that you may be satisfied with the results as they seem to work for you; however, for other readers of this thread I think it is important to understand why we use an expensive adjustable gas block (AGB) instead of the cheaper non-adjustable blocks. Just throwing an AGB on the barrel and setting it to the middle of the range and saying everything is good to go is not really "tuning" the rifle to your particular loads. That being said, you may have gotten lucky and this might just be the sweet spot for your rifle/loads. Ideally what you want to do is load 1 round in your magazine and begin to fire at each gas block adjustment position. You are watching for any issues but mostly want to make sure the the case ejects properly and the bolt stop catches and holds the bolt back for the next magazine. You will continue doing this (increasing the gas block adjustment) until you get that bolt to lock back, once it does then you will load 2-4 more rounds (without adjusting the gas block any further) and if the bolt locks back every time then you have tuned your rifle/load, if one of the 3-5 rounds does not lock the bolt back then increase your AGB another notch and do it again until all of them lock the bolt back effectively. The idea is that you are not over gassing the system and eliminating as much slap as possible for a smoother cycle and recoil. If you are going to run various loads (charges and bullet weights, etc.) then you're going to want to do this for each and note the gas block adjustment position for each. If you are not going to set the AGB properly to be tuned to your rifle/loads then I am not sure what benefit the expensive AGB is for you, I would think you would be just as happy with the lower priced non-adjustable gas block that is sending as much gas as possible down that tube - in effect this is what a lot of manufacturers do with their rifles to ensure that everything from junk rounds to the best of match rounds will cycle properly, but many folks would rather stick with one or two rounds that shoot lights out in their rifles and for this they would like to "tune" their rifles specifically for those rounds. Also, the other benefit an AGB provides is for shooting suppressed and un-suppressed and making sure you're not overgassing the system and potentially cause issues there when running a suppressor.

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southpaw68X171 MONTHS
Premium Member
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Re: 6.5cm AR10 Precision Build
12/14/2015

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wjm308,

Thanks for the feedback. I agree with your assessment of the purpose of the adjustable gas block.

I suppose I should have been more clear in my post with regard to the intent of my statement. I have seen numerous posts here and elsewhere that people have had trouble getting their 6.5CMs to function with out an adjustable gas block and that I had basically set mine to act as such and had no issues. I have limited rounds fired to this point. which means I have a known adjustment point from which to fire most loads.

I am not experiencing any bottoming of the buffer nor am I seeing any detrimental signs on my brass. I built it primarily as a hunting rifle and while I do care about accuracy and will most certainly do some tuning in the future for particular loads, for now the accuracy is adequate (1" groups out of 3 different loads) enough for me to grab a handful of rounds and hit the woods.

As this is my first adjustable gas block on a precision build, I honestly had not put much thought into the process of tuning, So thank you for the insight. I will follow this approach when time and ammo are more plentiful.

 

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southpaw68X171 MONTHS
Premium Member
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Re: 6.5cm AR10 Precision Build
12/14/2015 Last edited 12/14/2015 by southpaw68

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double tap...

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southpaw68X171 MONTHS
Premium Member
Corporal
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83 posts this site
Re: 6.5cm AR10 Precision Build
12/14/2015 Last edited 12/14/2015 by southpaw68

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double tap...server acting up.

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Birddog6424

XFirst Sergeant
Rating: 2.8/5 this site
1312 posts this site
Re: 6.5cm AR10 Precision Build
12/15/2015

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Seems like a lot of us are on the same page.

I also just divested myself of my AR10 308. Loved the rifle, it was just the wrong caliber for me. I need this rifle as my drop gun for long range bonus targets in 3 gun, and the 308 was just not quite up to the performance of the 6.5.

I also built on the Aero M5. And just like another poster, I had my reservations about the quality. I have always liked Aero for AR15, we sell their stuff here in the shop, but for myself, I wanted great stuff, not just good. But after building this rifle last week, my opinion is that these M5 sets are fantastic! Incredibly well built and thought out. Great quality.

For the rest of the build I went with the AR Gold trigger, XLR Tactical stock, JP Low Mass carrier with the High Pressure bolt, JP silent capture spring, JP rapid deployment 17.5" handguard, SLR gas block, AXTS Raptor charging handle, Ergo tactical palm shelf grip, and a Phase 5 BAD lever. The only place a deviated from my original build plans was the barrel. We are a JP dealer, so I get great pricing on their components. I was going to use their Supermatch 22" barrel. But then we stumbled onto the Ballistic Advantage barrels and got a screaming deal on a 22" 6.5 CM Premium Stainless hand-lapped Match barrel in the Hansen profile. So in the name of trying these barrels out for the shop, I'm going to run one. If I don't like it I'm not out much that I can't easily recoup. And of course, BA offers a 1" moa guarantee. From all I've heard they are great shooters.

ballisticadvantage.com/22-inch-6-5-rifle-ss-premium-barrel.html

It's all put together and topped with an American Defense 20 moa mount and a Burris XTR II 5-25. Just need to get out and knock the new car smell off it ")

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Birddog6424

XFirst Sergeant
Rating: 2.8/5 this site
1312 posts this site
Re: 6.5cm AR10 Precision Build
12/15/2015

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Here is my build.

Going to be a while before I get it Cerakoted the way I want. My guy is buried till after Shot trying to get other people's rifles ready for the show.

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i112.photobucket.com\/albums\/n179\/fcshorthairs\/6.5%20CM%20Gasser_zps5ffslxih.jpg"}[/IMG2]

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leftyk82

XSergeant
Rating: 3.0/5 this site
323 posts this site
Re: 6.5cm AR10 Precision Build
12/16/2015

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My wife's build in 6.5 Creedmoor



<a href="tinypic.com?ref=2zdq4k5" target="_blank"><img src="[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i68.tinypic.com\/2zdq4k5.jpg"}[/IMG2]" border="0" alt="Image and video hosting by TinyPic"></a>

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wjm308

XFirst Sergeant
Rating: 3.6/5 this site
2359 posts this site
Re: 6.5cm AR10 Precision Build
12/17/2015 Last edited 12/17/2015 by wjm308

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leftyk82 wrote:
My wife's build in 6.5 Creedmoor



<a href="tinypic.com?ref=2zdq4k5" target="_blank"><img src="[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i68.tinypic.com\/2zdq4k5.jpg"}[/IMG2]" border="0" alt="Image and video hosting by TinyPic"></a>​

Always nice to see PROOF carbon barrels, how does it shoot?

Birddog, I think a lot of folks will be very curious about how well the Ballastics Advantage barrel shoots, please share your results, thank you.

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Birddog6424

XFirst Sergeant
Rating: 2.8/5 this site
1312 posts this site
Re: 6.5cm AR10 Precision Build
12/17/2015

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There has been some buzz building about Ballistic Advantage. They are one of those little known manufacturers that are getting some momentum. With Aero Precision buying their company they now have some pretty deep pockets. Most of the feedback I am reading is pretty positive.

Another barrel maker I am watching very closely is Hardy Barrels out of New Zealand. They've been around a while and are pretty well-known down there. But now there is a US importer. I know the guys bringing them in, I am going over tomorrow morning to talk them about being their first US sponsored shooter.

Hardy has a fantastic carbon wrapped barrel that sells for a little south of $700, and can be had in a few weeks, versus waiting 6 months and paying $900 for Proof. We'll see how it goes.

hardyrifleengineering.co.nz/category/barrels

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kappbadbloodzXSergeant
Rating: 3.0/5 this site
211 posts this site
Re: 6.5cm AR10 Precision Build
12/18/2015

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Very nice! I am looking into something similar to your build. Does 6.5CM just drop into normal Magpul mags? Is it as simple as swap the bolt and barrel and you're good to go?





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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
12/19/2015 Last edited 12/19/2015 by padom
(1 vote)

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Bolt, mags, receivers, etc are the same as 308 ( I use the HP bolt for .264 calibers) you just have a barrel chambered in 6.5cm or .260rem.

Well Im mostly unpacked in my new place so Im starting to get some free time again. Now I can get back to finishing load development with the 123 Scenars / H4831sc load and move on to additional load development for my new 6.5cm semi. Next up will be Varget and H4350 to see how big of a speed difference there is from H4831sc. I can't see accuracy being any better since I got 5 shot groups in the .2's with 45.9g at 100yds with H4831sc.

Doesn't look like I ever uploaded the 45.9g grouping. This was the last load testing I did back on 11/4/15.

45.9g H4831sc
Hornady virgin brass
210's
123 Scenar

I chrono the load but don't remember what it was. I think it was in the mid 2600's. Will have to turn on my v3 and see what it was.

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/i580.photobucket.com\/albums\/ss250\/q9650\/Reloading\/123Scenar-H4831sc_OCW%20Scored_zpsbyg4b0e6.jpg"}[/IMG2]
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EricF517XGunny Sergeant
Rating: 3.1/5 this site
879 posts this site
Re: 6.5cm AR10 Precision Build
12/22/2015

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Holy Shit man you have a shooter there!!!

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bobketxXGunny Sergeant
Rating: 3.3/5 this site
744 posts this site
Re: 6.5cm AR10 Precision Build
12/23/2015

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Have three different 6.5 Creedmoor AR's from 21-24" with rifle length gas and one other 26" bolt gun, and they all feed well on H4350 with 123-140 Amax and Scenars-curious how 4831SC interacts with your gas settings, being a good bit slower than H4350, if I'm correct. Never needed to try more than H4350, or Varget with lighter Sierras/Scenars, but your results speak for themselves. Good shooter, nice build.

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Birddog6424
[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/media.scout.com\/media\/avatars\/0\/3\/Birddog6424.jpg"}[/IMG2]
XFirst Sergeant
Rating: 2.8/5 this site
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Re: 6.5cm AR10 Precision Build
12/23/2015

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I'm still on the fence about bullet weight. I also put in the JP high pressure bolt in hopes of coming up with a good load in the 140gr weight. I'm not really concerned about drop. If I can get an accurate round in the 2670 to 2700 fps range, it will shoot just fine. It will be all known yardage for this rifle.

My biggest concern is windage. It doesn't look like (on paper) that even significantly faster 130gr Hybrids or 123gr Scenars hold the wind as well the slower moving 140gr Hybrid. It boils down to 3 to 8 inches in most of the numbers I crunched, not much I agree. But 3 to 8 inches can be a hit or a shot just off the edge.

I guess it's going to boil down to real world velocities and conditions. I have some shooting to do.

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NewsShooterXSergeant
Rating: 3.2/5 this site
488 posts this site
Re: 6.5cm AR10 Precision Build
12/26/2015

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Been thinking I'd put an AR10 size build together, just saw that Aero Precision is offering 6.5 complete uppers, I think I'll have to put together one soon. aeroprecisionusa.com/m5e1-65-c...lete-upper.html
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stevieb92XPrivate
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Re: 6.5cm AR10 Precision Build
12/29/2015

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Some very nice builds posted in this thread.

Here are a couple pics of my Dad's rifle in 6.5CM that I put together for him. I apologize in advance for the crappy cell phone pics.

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/www.scout.com\/military\/snipers-hide\/forums\/5515-semi-auto-rifles\/%3Cimg%20src="}[/IMG2]">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/MATEN_Crop_zpsyz7udltn.jpg" title="i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/MATEN_Crop_zpsyz7udltn.jpg">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/MATEN_Crop_zpsyz7udltn.jpg"/>

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/www.scout.com\/military\/snipers-hide\/forums\/5515-semi-auto-rifles\/%3Cimg%20src="}[/IMG2]">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/20150515_095620_zpsdyg3hrvr.jpg" title="i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/20150515_095620_zpsdyg3hrvr.jpg">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/20150515_095620_zpsdyg3hrvr.jpg"/>

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/www.scout.com\/military\/snipers-hide\/forums\/5515-semi-auto-rifles\/%3Cimg%20src="}[/IMG2]">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/brake_01_zpsqqecords.jpg" title="i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/brake_01_zpsqqecords.jpg">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/brake_01_zpsqqecords.jpg"/>

[IMG2=JSON]{"data-align":"none","data-size":"full","src":"http:\/\/www.scout.com\/military\/snipers-hide\/forums\/5515-semi-auto-rifles\/%3Cimg%20src="}[/IMG2]">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/brake_02_zpsafohezwy.jpg" title="i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/brake_02_zpsafohezwy.jpg">i281.photobucket.com/albums/kk226/stevieb92/Dads%20Rifle/brake_02_zpsafohezwy.jpg"/>

Build list:

Mega MATEN Ambi set

Magpul 308 PRS

Krieger 22" 6.5 Creedmoor 1-8 barrel with JP small frame brake (brake was timed and blended by Krieger)

Young Mfg 308 N/M bolt carrier

SLR Sentry 9 Adjustable Gas Block

JP HP Enhanced Bolt (Kriger checked headspace with supplied bolt)

JP Extended Rifle Length Modular Handguard

Geissele SSA-E

Vortex Viper HS-T 4-16X44 MRAD

Vortex (American Defense) quick release mount

The group pic shown on the target was the first 5-shot group after going through the short barrel break-in recommended by Krieger and before any scope adjustment for zero. Using Factory Hornady 140 Amax ammo. Barrel took almost 8 months to arrive after order placement, but cleans up super quick and looks to be a great shooter.

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Darkop

X88 MONTHS
Premium Member
Sergeant
Rating: 3.1/5 this site
153 posts this site
Re: 6.5cm AR10 Precision Build
12/31/2015

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Hey Padom, how is this build proceeding? Any range time yet?

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Darkop

X88 MONTHS
Premium Member
Sergeant
Rating: 3.1/5 this site
153 posts this site
Re: 6.5cm AR10 Precision Build
12/31/2015

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Disregard ^^^^^^^^^^ post. Forum is acting up and won't allow an edit/delete.

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
12/31/2015

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Yes, please read above and previous pages. Gun is complete, shot 2 boxes of 140 Amax to tune gas block and function test and it shot amazing. I've done a load workup with 123L/H4831sc that shoots in the .2's pretty easily at 45.9g.

 

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flatland1XGunny Sergeant
Rating: 3.3/5 this site
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Re: 6.5cm AR10 Precision Build
12/31/2015

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I've also got a set of the Aero M5 receivers, and am going to chamber a Krieger AR10-contoured 6.5mm blank for the CM. I recently replaced the DPMS bolt in an AR10 I built in 6.5x47 several years ago with JP's 308 Enhanced HP bolt, and so will go with one of these bolts on my Aero/Krieger build. Have also ordered an SLR Sentry 9, but am as yet unsure whether to go with a JP LMOS carrier, or stick with a std weight one. If there's no downside to using the LMOS - especially being able to tune the rifle with the SLR gas tap, then that's what I'd like to do.

I've got several builds/re-barrel jobs in the shop ahead of being able to do the Krieger for the Aero M5 build, but also have an Aero M5E upper w/22" 6.5CM bbl on order. These uppers come w/o charge handle or BCG, so I'd like to hear from anyone who's used an Aero 308 BCG in a 6.5CM or 260 upper. Mainly, are the tolerances with their bolts tight enough where the firing pin hole/firing pin fit are concerned to avoid primer flow/cratering with anything but light loads? No sense dicking around with a std 308 bolt if it's going to behave the way the DPMS 308 bolt did in my 6.5x47 - the only primers I could use in that rifle without piercing or blanking with the original bolt were Wolf SRMs. Since there's apparently an import ban on the Russian primers, I don't want to paint myself into a corner by cheaping out on the bolt choice. Based on performance of the Krieger vs. BA bbl in the Aero upper, I'll be selling one or the other. Don't want to put parts in the Aero upper that will cause a potential buyer problems down the road, but neither do I want to make it so expensive that I won't be able to sell it.

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Smurgeon

XSergeant
Rating: 3.1/5 this site
191 posts this site
Re: 6.5cm AR10 Precision Build
01/02/2016

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Having a little New Year's fun with my Mega 6.5 creedmoor with JP Barrel and High Pressure bolt. Shoots like a dream with my Thunderbeast can and SLR adjustable block.

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arLPGXCorporal
Rating: 0.0/5 this site
62 posts this site
Re: 6.5cm AR10 Precision Build
01/02/2016 Last edited 01/02/2016 by arLPG

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What's your headspace on this gun? I assume it's pretty tight. Any lock up issues?

Great group and great shooting.


---------------------------------------------
--- padom wrote:

Bolt, mags, receivers, etc are the same as 308 ( I use the HP bolt for .264 calibers) you just have a barrel chambered in 6.5cm or .260rem.

Well Im mostly unpacked in my new place so Im starting to get some free time again. Now I can get back to finishing load development with the 123 Scenars / H4831sc load and move on to additional load development for my new 6.5cm semi. Next up will be Varget and H4350 to see how big of a speed difference there is from H4831sc. I can't see accuracy being any better since I got 5 shot groups in the .2's with 45.9g at 100yds with H4831sc.

Doesn't look like I ever uploaded the 45.9g grouping. This was the last load testing I did back on 11/4/15.

45.9g H4831sc
Hornady virgin brass
210's
123 Scenar

I chrono the load but don't remember what it was. I think it was in the mid 2600's. Will have to turn on my v3 and see what it was.

---------------------------------------------
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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
01/03/2016

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Fired case headspace measures 1.530". I have zero issues with the gun, it runs like a sewing machine.
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arLPGXCorporal
Rating: 0.0/5 this site
62 posts this site
Re: 6.5cm AR10 Precision Build
01/03/2016

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> padom wrote:> Fired case headspace measures 1.530". I have zero issues with the gun, it runs like a sewing machine.

What do your unfired cases measure? I might have missed it in an earlier post.

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green338XFirst Sergeant
Rating: 3.1/5 this site
1034 posts this site
Re: 6.5cm AR10 Precision Build
01/03/2016

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Did you buy the barrel with that contour or did your gunsmith contour it to your specifications?

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
01/03/2016

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It was custom contoured by my smith

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
01/03/2016

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Whatever virgin Hornady Match 6.5cm measures is my unfired case measurement.

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10ring1XSergeant
Rating: 3.1/5 this site
187 posts this site
Re: 6.5cm AR10 Precision Build
01/27/2016

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tag...

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MuteOneX160 MONTHS
Premium Member
Gunny Sergeant
Rating: 3.1/5 this site
689 posts this site
Re: 6.5cm AR10 Precision Build
01/28/2016

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Nice build. Now I'm going to have to build one even though I already have a .308. Of course, being both an Aero Precision and Ballistic Advantage dealer, you know which direction my build is going to go.

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cactusbrewXSergeant
Rating: 3.1/5 this site
311 posts this site
Re: 6.5cm AR10 Precision Build
02/26/2016

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Beautiful rifle. What's the total weight minus optic and mount?

I am thinking I might be calling keystone myself in the next few months.

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
02/26/2016 Last edited 02/26/2016 by padom

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I never weighed it but I just threw it on the scale with Seekins Rings, Vortex Razor HD 5-20x50 and Harris 6-9 Swivel bipod with podlock and it weight 14lb. Probably looking at about 10.5lbs without bipod, scope and rings.

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leftyk82

XSergeant
Rating: 3.0/5 this site
323 posts this site
Re: 6.5cm AR10 Precision Build
02/26/2016

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wjm308 wrote:

leftyk82 wrote:
My wife's build in 6.5 Creedmoor



<a href="tinypic.com?ref=2zdq4k5" target="_blank"><img src="

" border="0" alt="Image and video hosting by TinyPic"></a>​

Always nice to see PROOF carbon barrels, how does it shoot?

Birddog, I think a lot of folks will be very curious about how well the Ballastics Advantage barrel shoots, please share your results, thank you.​

Shoots very well, 1/2 to 3/4 minute in her hands, which is when she is shooting her best.

 

[Guest]

cactusbrewXSergeant
Rating: 3.1/5 this site
311 posts this site
Re: 6.5cm AR10 Precision Build
02/26/2016

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padom wrote:

I never weighed it but I just threw it on the scale with Seekins Rings, Vortex Razor HD 5-20x50 and Harris 6-9 Swivel bipod with podlock and it weight 14lb. Probably looking at about 10.5lbs without bipod, scope and rings.​

Thanks for the reply. I think in a few months, I might be building a near clone of your rifle.

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
02/27/2016 Last edited 02/27/2016 by padom

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I got a chance to get out and shoot an 140Amax/H4350 OCW test today. I will probably do a seating depth test with 42.8g which had a velocity of 2708, ES7 and SD3.

Virgin Hornady brass
H4350
210M
140 Amax
2.1985" Ogive
.0455" off the lands

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CMonty256

XSergeant
Rating: 3.0/5 this site
288 posts this site
Re: 6.5cm AR10 Precision Build
02/29/2016

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Sure you wouldn't want 41.8? instead of 42.8?

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
02/29/2016 Last edited 02/29/2016 by padom

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I would agree 41.8g is definitely the low node OCW. Was hoping for a higher velocity but im just gonna go with 41.8 and test seating depth today to see if that group shrinks anymore.

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padom

XFirst Sergeant
Rating: 3.8/5 this site
3044 posts this site
Re: 6.5cm AR10 Precision Build
03/01/2016

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I shot OCW's with both 123 Lapua and 139 Lapua Scenars and H4350 today. The 123L using H4350 are 100+fps faster than H4831sc with a lot less powder. For example, 44g H4350 is 2888 for 46.2g H4831sc which is 2765. I just love the Lapua Scenars, they are extremely accurate.



123 Lapua Scenar / H4350 OCW

139 Lapua Scenar / H4350 OCW

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nilescoyote

XFirst Sergeant
Rating: 3.6/5 this site
4209 posts this site
Re: 6.5cm AR10 Precision Build
03/01/2016

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padom wrote:
I would agree 41.8g is definitely the low node OCW. Was hoping for a higher velocity but im just gonna go with 41.8 and test seating depth today to see if that group shrinks anymore.​

Don't feel bad, mine is about 100 fps slower with 140 amax with the same powder charges. As well as your 123's compared to my 130 berger's... 22" JP barrel, here.

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wjm308

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
03/02/2016

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padom wrote:
I shot OCW's with both 123 Lapua and 139 Lapua Scenars and H4350 today. The 123L using H4350 are 100+fps faster than H4831sc with a lot less powder. For example, 44g H4350 is 2888 for 46.2g H4831sc which is 2765. I just love the Lapua Scenars, they are extremely accurate.



123 Lapua Scenar / H4350 OCW

​

Nice! I have my F&D Defense 6.5 to test and PROOF is sending back my custom built AR-10 in 6.5 Creedmoor, I will hopefully be doing some shooting soon. My first batch will be some Hornady Match ammo with 140 ELD-M, 120 AMAX and then some Prime Ammunition with Norma 130 match. After that I will begin to setup load development and walk through the same OCW as above...

 

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
03/02/2016 Last edited 03/02/2016 by padom

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I went with 43g H4350 for my 123 Lapua load and loaded up a seating depth test today. These things shoot great from .05" to .02" off the lands. I will stick with 2.2615" Ogive or .03" off the lands as my load. 43g is 2837 ES 4 SD 2. I couldn't be happier with this load for my semi auto.

I also loaded up a Berger 130 AR Hybrid H4350 OCW test last night to test today. I bought a 500ct box to shoot in my .260Rem and they just didnt shoot as well as the 139L and 123L so I saved them to test in my 6.5cm semi auto. Distance to lands was only 2.2475" Ogive or roughly 2.8475" COAL which easily fits in my KAC 10rd mag. I seated the 130's for my OCW to 2.2325" Ogive or roughly .015" off the lands. Boy did these things shoot amazing in my semi. Saying Im extremely happy with the results is an understatement. I wish I loaded up one more charge weight of 43.5g. I did not shoot these over the chrono so I don't have numbers but will load up 43.0, 43.2 and 43.4 and shoot them over the chrono tomorrow. If 43.4g POI stays the same as 43g and 43.2g than I will go with 43.2g as my OCW.

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padom

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Re: 6.5cm AR10 Precision Build
03/02/2016 Last edited 03/02/2016 by padom

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I can't say enough great things about all the parts I used in my 6.5cm precision semi auto build. A huge thanks to John at Keystone Accuracy for doing an amazing job with this 22" Bartlein barrel. The gun runs like an Italian super car, its super soft shooting with the gas setting on my Syrac AGB almost all the way closed and accuracy across a wide range of 123g to 140g projectiles puts it right up there with most custom bolt guns. While I was skeptical about going with this Aero Precision M5 receiver set over the MEGA, it made me a believer and I wouldn't hesitate to build another AR10 with one. Its rock solid and fit and finish are excellent.

I also love the KAC SR25 magazines. They allow the longest COAL that I know of for DPMS LR308 pattern semi auto's with a COAL of 2.865" vs 2.82 - 2.832" COAL for the Magpul LR20 and Magpul M118LR magazines. Yes, they are expensive but in my opinion well worth the money.

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R700LRXSergeant
Rating: 3.0/5 this site
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Re: 6.5cm AR10 Precision Build
03/02/2016

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padom, still running the standard buffer and JP buffer spring?

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padom

XFirst Sergeant
Rating: 3.8/5 this site
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Re: 6.5cm AR10 Precision Build
03/02/2016 Last edited 03/02/2016 by padom

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Yep, still running a JP Custom Centerless Ground and Polished Rifle length buffer spring for large-Frame AR's and a DPMS 308 style rifle length buffer.

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R700LRXSergeant
Rating: 3.0/5 this site
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Re: 6.5cm AR10 Precision Build
03/02/2016

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Thanks. Finally starting to get pieces for my build.

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steinmasterXSergeant
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Re: 6.5cm AR10 Precision Build
03/04/2016

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Tag

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Elfster4321

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
03/04/2016

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Funny you say this. I plan on getting some kac magazine for my 6.5 MEGA custom. Thanks for the info friend!

padom wrote:

I can't say enough great things about all the parts I used in my 6.5cm precision semi auto build. A huge thanks to John at Keystone Accuracy for doing an amazing job with this 22" Bartlein barrel. The gun runs like an Italian super car, its super soft shooting with the gas setting on my Syrac AGB almost all the way closed and accuracy across a wide range of 123g to 140g projectiles puts it right up there with most custom bolt guns. While I was skeptical about going with this Aero Precision M5 receiver set over the MEGA, it made me a believer and I wouldn't hesitate to build another AR10 with one. Its rock solid and fit and finish are excellent.

I also love the KAC SR25 magazines. They allow the longest COAL that I know of for DPMS LR308 pattern semi auto's with a COAL of 2.865" vs 2.82 - 2.832" COAL for the Magpul LR20 and Magpul M118LR magazines. Yes, they are expensive but in my opinion well worth the money.​

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Defender3XCorporal
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Re: 6.5cm AR10 Precision Build
03/05/2016 Last edited 03/05/2016 by Defender3

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Elfster4321 wrote:
Funny you say this. I plan on getting some kac magazine for my 6.5 MEGA custom. Thanks for the info friend!

padom wrote:

I can't say enough great things about all the parts I used in my 6.5cm precision semi auto build. A huge thanks to John at Keystone Accuracy for doing an amazing job with this 22" Bartlein barrel. The gun runs like an Italian super car, its super soft shooting with the gas setting on my Syrac AGB almost all the way closed and accuracy across a wide range of 123g to 140g projectiles puts it right up there with most custom bolt guns. While I was skeptical about going with this Aero Precision M5 receiver set over the MEGA, it made me a believer and I wouldn't hesitate to build another AR10 with one. Its rock solid and fit and finish are excellent.

I also love the KAC SR25 magazines. They allow the longest COAL that I know of for DPMS LR308 pattern semi auto's with a COAL of 2.865" vs 2.82 - 2.832" COAL for the Magpul LR20 and Magpul M118LR magazines. Yes, they are expensive but in my opinion well worth the money.​

You may want to check the LaRue mag also as I believe it will do 2.87.

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padom

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Re: 6.5cm AR10 Precision Build
03/05/2016 Last edited 03/05/2016 by padom

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I just measured my KAC again. 2.8710"

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padom

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Re: 6.5cm AR10 Precision Build
03/05/2016 Last edited 03/05/2016 by padom

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As an update I got a chance to shoot 43g and 43.2g H4350 with the 130 AR Hybrids over the chrono the other day and both loads chrono dead on at 2799. Not bad at all.

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nilescoyote

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Re: 6.5cm AR10 Precision Build
03/05/2016

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padom wrote:
As an update I got a chance to shoot 43g and 43.2g H4350 with the 130 AR Hybrids over the chrono the other day and both loads chrono dead on at 2799. Not bad at all.​

43.1gr. is where I found the center of my ES/SD node with that bullet and powder for my bolt rifle.

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padom

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Re: 6.5cm AR10 Precision Build
07/13/2016

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Ive been shooting 123 Amax over 37.8g Varget lately with newly fireformed .243 Winchester to 6.5cm cases and they are shooting tiny little groups. Had a chance to take them out to 700yd a month ago and they didnt let me down. Plugged my numbers into Shooter app and they were dead on.

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LA260XSergeant
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Re: 6.5cm AR10 Precision Build
07/27/2016

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Birddog6424 wrote:

Here is my build.

Going to be a while before I get it Cerakoted the way I want. My guy is buried till after Shot trying to get other people's rifles ready for the show.

Nice!!! I ordered the 17.25" JP RC handguard as well for my 6.5CM build.
Which Sentry gasblock did you get to work with the JP handguard? Is there enough clearance? I ordered the 9C but doubt if its going to work.​

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Birddog6424

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Re: 6.5cm AR10 Precision Build
07/29/2016

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Here is the updated photo of that rifle.

I've since gotten it cerakoted by Brock Gardner of MCM Firearms, I've broken both scope caps, and gotten it super dirty. This rifle is an absolute hammer. It puts a smile on my face every time I take it out. It shoots consistent .5" MoA out to 500 yards, Prepping this rifle for my girlfriend to shoot in a PRS match last Sunday, she stacked three shots right on top of each other at 500 yards, and in her first ever PRS match, she got a first round cold bore hit at 1177 yards.

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bigjake83XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
07/30/2016 Last edited 07/30/2016 by bigjake83

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padom wrote:

I just measured my KAC again. 2.8710"​

Lol... I bet a lot of women have been disappointed with only a 2.8710" KAC

I'm glad to see you build worked out for you.. who was that guy on here who was having tons issues with his Proof Research Barrel??

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HAUSSMANXCorporal
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Re: 6.5cm AR10 Precision Build
12/22/2016

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What barrel are you going with now?

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padom

XFirst Sergeant
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Re: 6.5cm AR10 Precision Build
12/23/2016

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I have something new from PVA being spun up. Stay tuned ....

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Scotts556XSergeant
Rating: 3.0/5 this site
474 posts this site
Re: 6.5cm AR10 Precision Build
12/26/2016

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Everytime you fire your rifle the buffer hits the end of the tube. It "bottoms out" every time the action cycles.

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[padom]

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