Bravo Company Compensator Tuned slots and interior cone offer maximum in recoil mitigations, compensation of muzzle-rise, and flash reduction Dual action brake minimizes side pressure and designed to have much less noise associated with typical compensators Includes a Crush Washer Nitride treated for maximum corrosion resistance 5.56 Mod 1 - Should be installed by a qualified armorer. Extended version of the BCMGUNFIGHTER MOD 0 - 5.56. Mount per BATF specs to bring your 14.5 inch barrel over 16 inches (non-NFA). Threaded 1/2 x 28 for 5.56mm AR15 platforms. Predrilled hole at the base for permanent installation 7.62 variant : Threaded 5/8 x 24 for 7.62mm AR10 and many 300 AAC Blackout barrels. Should be installed by a qualified armorer.