Sub Sonic 300blk upper

[Tackleberry]

Who makes the best upper for shooting subs in a 300blk out?

 

[Sniperwannabee]

For the price you can't beat radical fire arms


https://www.joeboboutfitters.com/Radical-Firearms-Complete-Uppers-s/114877.htm

 

[strikeeagle1]

Never sure about the superlative "best", but this Primary Weapons Systems is a pretty awesome armadillo getter. This 9.75" upper has a long-stroke piston ala AK47. It is quite versatile with either red dots or scope.
Build list:

PWS Mark 109, 9.75” 1:8 twist
Surefire WarComp QD muzzle device
Surefire 762 SOCOM2 suppressor
Aimpoint T-1 , LaRue LT660HK QD
Surefire X300 Ultra
Trijicon RMR 3.25 MOA
LaRue LT872 QD RMR mount
Schimdt & Bender 1.1-4X Short Dot on LaRue QD mount
Precision Reflex Gas Buster charging handle


Lower: Limited edition GPI Legacy Arkansas Ranger M4A1
Magpul MAID grip
Leitner Wise Buffer retainer
Magpul aluminum trigger guard
Geissele SSA trigger
Battle Arms short throw ambidextrous safety
Wilson Combat match grade small parts
Wilson Combat buffer tube
Trident Tactical buffer spring
Law Tactical Gen3-M folding stock adapter
Rogers Super-Stok & cheek pad
Rogers single point harness adapter / sling QD
Phase 5 bolt assist lever
Rogers Mag-Grip
Tactical Innovations Teflon tension screw
Fabricated stock-ELS-spare magazine carrier system
Rogers Magazine Grip

 

[padom]

I tested 3 9"-10.5" 300blk barrels and found the Rainier Ultramatch 10.5" to be the most accurate of all. I don't shoot subs but the 125smk and 125 TMK with H110 is 0.5moa. Shot a 7x5 at 100yds with a 0.52" agg.

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[Pesekcw]

I have a ranier ultra match on my sub gun, 1-1.25 Moa consultant with 208-220 subs. I load my own but even with shit remington ammo I’ve gotten 1.25

 

[padom]

I have a ranier ultra match on my sub gun, 1-1.25 Moa consultant with 208-220 subs. I load my own but even with shit remington ammo I’ve gotten 1.25

I messed with 208 ELD-M subs briefly and was getting 0.75 moa. I have no use for subs and the way my 125 TMK supers shoot at 2100fps I have no reason too. I can go 5/5 on steel from 200-500M without any effort.

 

[Pesekcw]

I messed with 208 ELD-M subs briefly and was getting 0.75 moa. I have no use for subs and the way my 125 TMK supers shoot at 2100fps I have no reason too. I can go 5/5 on steel from 200-500M without any effort.

I’m limited to subs with my night vision, can only take that recoil impulse. I usually ding pigs out at around 150 with no isse

 

[MSTN]

I kind of like mine:

 

[MSTN]

I tested 3 9"-10.5" 300blk barrels and found the Rainier Ultramatch 10.5" to be the most accurate of all. I don't shoot subs but the 125smk and 125 TMK with H110 is 0.5moa. Shot a 7x5 at 100yds with a 0.52" agg.

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That is quite impressive!

You're loading some accurate ammo, plus doing some solid shooting with no mistakes.

 

[padom]

That is quite impressive!

You're loading some accurate ammo, plus doing some solid shooting with no mistakes.

Thanks. That was shot at 100yds with no can, Harris bipod, rear bag and my Razor 5-20x50 for load confirmation after OCW testing.125 SMK is just as accurate with same load.

 

[Strykervet]

I like the KAC uppers myself but most of mine sport Noveske bbl.'s and use JP bolt groups. Noveske makes a damn good .300BLK barrel and the 8.5" and 8.2" bbl.'s aren't only accurate, they're reliable, and the JP BCG's are about the finest made, super slick and reliable. One has an MPW collapsible stock and it also works without a hiccup. That actually surprised me, since I figured that particular stock would make it worse with the recoil system but it didn't. Subs, supers, suppressed or not, it fires 'em all, even mixed in the mag with different loads, etc. It was unlubed and way dirty last time and it still worked. I don't use adj. gas blocks either. All four of my rifles will function like this, none have adj. gas blocks.

The KAC upper is a completely different animal than an AR upper and comes in 9.5" (shortest). If I were gonna buy an upper or a new AR rifle today, it'd be a KAC. I used to build all my AR's but the new rifles they make are so improved it's not worth it. Most of the magic is in the upper, but the lowers are also special too. You and I can't easily build one, they use almost totally proprietary parts now.

AAC makes or made a decent upper, I have one in 16". It was right at 1MOA out of the box. Thin barrel but worth mentioning. Came with KAC URX2. The Noveske's will shoot that too, probably better but I've never really stabilized the rifles on a bench to find out just how much better and most have red dots anyway.

Those are the ones I have and have experience with, can't speak for the others but I'm sure there are a lot of other fine ones out there. If you build it yourself, just make sure the barrel is a good one and won't require an adjustable gas block to cycle (even if you plan on using one). I'd get the JP BCG, there MAY be others as good, possibly better but I don't know of any. The full mass carrier and bolt are nearly impossible to best, slick as snot and I've used 'em dry and dirty many times in 4 calibers and they always work.