BSF Barrels AR-15 22 ARC 22" 1:7 Twist Barrel

BSF lists this one as a 22 ARC barrel for AR-15 pattern rifles, 22" long with a 1:7 twist. The 22 ARC is a small bore cartridge from the ARC case family, and a 1:7 rate is on the fast end for that bore - the kind of spin the longer, heavier .22 projectiles ask for.

Twenty two inches is longer than most AR barrels run, and the reason to go there is velocity: more barrel means more time for the powder to work before the bullet leaves. Gas system length, gas block journal, profile and muzzle thread are not listed for this barrel, so confirm those against your build before ordering.