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 Stainless Steel construction for maximum corrosion resistance Predrilled hole at the base for permanent installation Includes a Crush Washer 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.