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[james89]

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[kcheung2]

1) 1.237 inches + 4 inches does not equal 16 inches. For a long gun, you can use any combination of barrel + muzzle device length, as long as they are pinned/welded, and they total 16 inches or longer.

2) Have you built an AR yet? A 16" setup, with the buffer tube but no stock, totals out to over 30" already.

3) Not gonna touch this one. Although you should clarify if you mean the differences physically/dimensionally, or legally.

[Cadre]

Kamala is that you?

[james89]

I meant 12.37, sorry. And dang it does hit 30" quickly. Thanks for the answers. New to building ar's, I've only shot them and totally forgot about the tube when doing calculations. D'oh.

I also had no idea that #3 was a touchy subject. I just thought I'd ask, I was genuinely curious.

I've shot lever actions, mini 14s, revolvers, semi auto pistols and pump shotguns but never built an AR. Shot them but this is the first time building. Had a brain fart with the tube. So many laws to learn about!

[sbo80]

an AR pistol has no stock. An SBR does. The whole "brace" thing is a separate conversation. If you are buying a lower to build out, you can't build a pistol anyway, because pistols are governed by the "roster", which the AR is not on. It's illegal to manufacture an off-roster pistol, and the lower you buy will be transferred as a rifle, even if it isn't built yet.

[SISKIN]

FIELD OF DREAMS " BUILD IT AND THEY WILL COME "....

[james89]

Thank you for the information. Can I put a ar pistol brace on my ar rifle as long as it meets the overall length requirements?

[sigstroker]

Yeah, but why on earth would you want to do that?

[ARDude]

Op, 12 inch barrels with a 4 inch muzzle device is actually very popular with retro builds. XM177 barrels are still popular since Vietnam.

[james89]

Just to try it out. See how it feels. Lol

@ARDude: I see... that's an interesting build, thank you for that information!

[ar15barrels]

Can I get a 1.237" barrel and get a long muzzle brake or a linear/regular compensator around 4"+ and pin and weld that for a "16"" barrel?

I'll assume for a minute you mean a 12.37" barrel.
A 12.37" AR type barrel will usually have 0.62" of threads so the muzzle device will overlap the barrel by 0.62" or a little less if you use a washer or shims to time the muzzle device.

The math on the barrel length would be: 12.37 - 0.62 + 4 = 15.75"
It turns out that 15.75" is less than 16".

[ar15barrels]

Op, 12 inch barrels with a 4 inch muzzle device is actually very popular with retro builds. XM177 barrels are still popular since Vietnam.

It actually takes a 12.75" barrel to get a 4" muzzle device to surpass 16" length.

[ARDude]

It actually takes a 12.75" barrel to get a 4" muzzle device to surpass 16" length.

Got it. Randall, you are the man to go to for just about any kind of AR work. Or any gunsmith work.