AR Pistol 10.5 adjustable gas block or nah?

[Nguyen]

I'm building a ar pistol with a 10.5 inch barrel. Now, this is my first time actually building a ar15 pistol that has a 10.5 inch barrel. All my ar pistols have 11.5+ barrel length. I heard a lot of stories that 10.5 barrels can be over gassed.

My question is, should I throw in a adjustable gas block or save 30 bucks and just run a heavier buffer. Many forum post I've read regarding 10.5 being over gassed are a few years old. So i dont know if its still the same today.

[dozer wright]

Do it won't hurt and can only help .

[Quiet]

Okay, I'm building my first ar pistol with a 10.5 barrel. I'm currently using a faxon barrel for this build. Now, my question is... should I get a adjustable gas block? I have a 11 inch ar pistol, but what I've been reading... 10.5 inch pistols/sbrs can be overgassed. Instead of wasting money trying to figure out what buffer weight i should run, will it be a better idea just to use a adjustable gas block?

Thanks fam.

In order to legally make it, it needs to be a dimensionally compliant bolt-action or break-top/open single-shot pistol that has never been semi-auto.

Which means you can not install a gas tube/piston and functional gas block onto the pistol (either no gas block or use a gas block that has been plugged).

[Nguyen]

In order to legally make it, it needs to be a dimensionally compliant bolt-action or break-top/open single-shot pistol that has never been semi-auto.

Which means you can not install a gas tube/piston and functional gas block onto the pistol (either no gas block or use a gas block that has been plugged).

Yeah I know.

I should've typed it better.. I'm building my first AR15 that has a 10.5 barrel.

All my ar pistols have 11.5 - 12.5 barrels.

I edited my previous post.

[Grumpyoldretiredcop]

Once you've built the contemplated firearm in a compliant condition, and assuming that somewhere down the road you contemplate altering it to function as a semi-automatic, you'll find that the 10.5 is not that likely to need an adjustable gas block unless the gas port has been drilled far too large. Check the ejection pattern as a first clue; it should eject in the 2:30 to 3:00 range if properly gassed.