16" 300 Blackout Short Stroking

[tjkane1]

Buffer weight changes seem to be a common go to with 300blk trouble shooting.
Here's another resource if you haven't found it already.
http://www.300blktalk.com/forum/

 

[mtdawg169]

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)

Who made the barrel and do you have a picture of the malfunction? If it is truly short stroking, a heavier buffer isn't the answer. Are you certain that you're using a carbine length action spring and not a rifle spring? Pending disclosure of the barrel manufacturer, I'm leaning towards a gas system length / gas port size issue.

 

[Realstudent368]

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.

Requires barrel change?

 

[JDG.]

Requires barrel change?

Depends. Some people weld the hole and redrill. It sounds. Like the op has a def prob if he cant get factoey loaded supers to run.

 

[Realstudent368]

Depends. Some people weld the hole and redrill. It sounds. Like the op has a def prob if he cant get factoey loaded supers to run.

Did he say he was suppressed? And running subs?

 

[JDG.]

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

Says supers here

 

[sold7]

check your extractor spring

I had one that acted like that it was just letting go of the brass

 

[mtdawg169]

Depends. Some people weld the hole and redrill. It sounds. Like the op has a def prob if he cant get factoey loaded supers to run.

This would make sense if the port is too large. But if it's short stroking, it's not getting enough gas and would need to be opened up. There are way too many manufacturers jumping on the 300blk bandwagon with no understanding of the pressure curves involved.

 

[JDG.]

This would make sense if the port is too large. But if it's short stroking, it's not getting enough gas and would need to be opened up. There are way too many manufacturers jumping on the 300blk bandwagon with no understanding of the pressure curves involved.

I was responding to changing it to a pistol length system. It sounds like its severly under gassed if it wont run supers. The op says the gas block is lined up, but thats where i would check first followed by port size.

 

[mkdhotrod]

switch to a reliable caliber like... 5.56, you know the round the rifle was built for. It may fix your issue.. Well, as for advice, I have none. But the .50 Beowulf looks cool too.