Build question

Blackstar65 · Jan 5, 2015

With the recent SBR trouble I am rethinking my plans. I am building a. 300 AAC rifle. If I go with a 16“ barrel does it have to be a "hbar"? I know anything in a . 556 needs to be a" hbar" unless it a pistol or NFA item. Thanks for the help.

Vile Shadow · Jan 5, 2015

I think the OD of a .300 barrel is the same as an HBAR barrel.

DaemonAssassin · Jan 5, 2015

Blackstar65 said:
With the recent SBR trouble I am rethinking my plans. I am building a. 300 AAC rifle. If I go with a 16“ barrel does it have to be a "hbar"? I know anything in a . 556 needs to be a" hbar" unless it a pistol or NFA item. Thanks for the help.

A 300BLK barrel is by definition an HBAR, due to the size of the bore.

I'm building one for deer hunting and I am in the clear, because the barrel doesn't narrow down under the handguards.

BTW, there is no definition as to what HBAR really is, in COMAR. It is safe to assume that a 300BLK barrel is HABR, because the standard 223 size barrel, bored out to 300, would not be able to contain the pressures involved as the bullet transits the bore.

outrider58 · Jan 6, 2015

You can always get a 14.5'' barrel and pin/weld a muzzle device(maybe a suppressor/muz. brake) on it to achieve 16'' minimum. That's the rout i'm taking, for now.

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