Threaded 5/8 x 24 for 7.62mm AR10 and many 300 AAC Blackout barrels; 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; Includes a Crush Washer; Should be installed by a qualified armorer