16" 300 Blackout Short Stroking

[DFWLR]

Well, my rifle is taking after his owner... and is short stroking. The rifle is pretty much a bolt action at this time. I have built several ARs, and this is the first time I have ran across the problem. Thing is, there is so much contradicting information on the interwebs. I am cautious to drilling on my barrel, but thinking this may be the best option. Anyone else run across this? Fixes? (Gas block is properly aligned)

 

[JDG.]

Gonna need a bunch more info. Gas length, buffer weight, build materials, etc...

 

[DFWLR]

Gonna need a bunch more info. Gas length, buffer weight, build materials, etc...

Carbine gas system (pretty sure they all are), .750 gas block, carbine buffer, run of the mill 16" barrel with 1:8 twist

 

[synspeed]

Had the same issue with me .300 SBR. Swapped to a heavier buffer and it helped some. Also upped my powder charge on my handloads, if that's what your shooting.

 

[Realstudent368]

Are you running suppressed? Subsonic?

 

[bikeboy636]

well, my rifle is taking after his owner... And is short stroking. The rifle is pretty much a bolt action at this time. I have built several ars, and this is the first time i have ran across the problem. Thing is, there is so much contradicting information on the interwebs. I am cautious to drilling on my barrel, but thinking this may be the best option. Anyone else run across this? Fixes? (gas block is properly aligned)

im running a 9.5" 1:7 twist cmmg 300 blk barrel and i had to open the gas port a little bit to cycle my sub sonic 208 a-max with my suppressor.

 

[JDG.]

If gas block is aligned as stated, i would mess with buffer weights as already suggested. It doesnt sound like you have the proper tools to mess with/measure/resize the gas port so maybe have a gunsmith look at that.

Pistol length gas systems seem to fix the problems sometimes, they are available.

 

[tjkane1]

Is it happening with both sub and supersonic ammo? Factory loaded or hand loaded ammo? Quite a few 300blk barrels have pistol gas systems(at least on shorter barrels).

 

[DFWLR]

All factory loads.. sub and super .. doesn't matter. Same issue.

 

[JDG.]

If its happening with supers, theres def a issue. Most folks have issue getting subs to run reliably not supers