DPMS 6.5 Creedmoor Short Stroking

[SONIC SAAMI]

Today I picked my my DPMS LR 6.5 Creedmmor that I found on line 934.83 + 20.00 shipping.

First thing was to do a safety check making sure everything was in working order with the rifle and all parts installed correctly.
The bore and chamber were then cleaned using Butch's Bore Shine a Dewey Rod with bore guide and rifle given a good lube.

Next a Mark 4 M5 was mounted in a set of Seekins rings.

Ammo: Hand loads with 140 A-Max's and 41.5g of H-4350
The factory OCL of 2.820 was to long for the mags
rounds had to be seated @ 2.800

With this all done it was time to head out to the range.

The rifle short stroked every round!

I took a spare AR-10 buffer spring I had cutting it down un tell the rifle would run.
FIXED!
With the junk trigger I managed some sub MOA groups with the rifle showing some potential.
100m 0
200m .7mil
300m 1.6mil
400m 2.5 mil
500m 3.5 mil

I have a GEISSELE Hi-Speed Match trigger and PRS on order will post some pics when I get them installed on the rifle.

 

[Mike Stolfus]

Re: My DPMS 6.5 Creedmoor

Thanks for the Range report. If your rifle was short stroking, are you sure the Gas block is lined up correctly?

 

[hilbillee]

Re: My DPMS 6.5 Creedmoor

My upper in 6.5 Creedmoor was short stroking at first. I called DPMS and they said it sounded like the gas flow was off and had me send the upper back. It was back in my hands in less than 2 weeks working perfectly. They had fixed the gas problem. I tried the buffer spring thing like you did at first but it didn't help.

 

[SONIC SAAMI]

Re: My DPMS 6.5 Creedmoor

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BPAWoodwalker</div><div class="ubbcode-body">Thanks for the Range report. If your rifle was short stroking, are you sure the Gas block is lined up correctly? </div></div>
It is ..Yes.

I realize cutting down the buffer spring is a Band-Aid but I want to run the rifle in the Vegas match this weekend shitty trigger and all.
I have had 7 AR-10s this being my first DPMS.

On a side note rifle came with Forward Assist I thought is was going to be slick sided like the other LRs I've seen

 

[bowslngr]

Re: My DPMS 6.5 Creedmoor

If your BCG is a tight fit in the upper, perhaps the parts just need to wear together a bit.

Interesting that you could not fit the factory 140 A-maxs into a stock magazine. Mine have all fit with no issues...in at least three or four different styles of magazines. Two of those styles were factory DPMS.

 

[Mike Stolfus]

Re: My DPMS 6.5 Creedmoor

Do you have any of the .308 P-Mags to try with your ammo?

 

[bowslngr]

Re: My DPMS 6.5 Creedmoor

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BPAWoodwalker</div><div class="ubbcode-body">Do you have any of the .308 P-Mags to try with your ammo? </div></div>

If you are asking me, no I don't. Maybe I will pick one up and try it out.

I don't like shooting high capacity mags off a bench. They just get in the way.

 

[SONIC SAAMI]

Re: My DPMS 6.5 Creedmoor

I didnt cut the stock spring and will give it a try and post back.
I have 2 P Mags they are 2.824 on the inside
The factory mags I have are 2.827

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: bowslngr</div><div class="ubbcode-body">If your BCG is a tight fit in the upper, perhaps the parts just need to wear together a bit.

Interesting that you could not fit the factory 140 A-maxs into a stock magazine. Mine have all fit with no issues...in at least three or four different styles of magazines. Two of those styles were factory DPMS. </div></div>

 

[SONIC SAAMI]

Re: My DPMS 6.5 Creedmoor

I will send the rifle back in after this weeks match the cut down spring is just a band aid...weaken the spring the bolt might not lock up.

 

[schiaa]

Re: My DPMS 6.5 Creedmoor

You might want to try David Tubb's CS Buffer Spring. They sell for 30 dollars on Brownells. I have one on order for my LR-6.5; will report back here how it works.

 

[mattsnuked]

Re: My DPMS 6.5 Creedmoor

Get an adjustable gas block from JP before you send it back. Best thing I ever did to my DPMS.

 

[SONIC SAAMI]

Re: My DPMS 6.5 Creedmoor

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: mattsnuked</div><div class="ubbcode-body">Get an adjustable gas block from JP before you send it back. Best thing I ever did to my DPMS. </div></div>
That would work if the rifle were over gassed

 

[VKC]

take a look at slash buffers