This tri-lug muzzle brake gives you the ability to quickly attach a sound suppressor without sacrificing flash mitigation and recoil management when shooting unsuppressed. Featuring a universal 3-lug interface, this 3-lug muzzle brake can quickly interface with any pistol caliber sound suppressor as well as the Angstadt Arms 3-Lug QD Blast Shield! Made from hardened steel with a black nitride finish Install muzzle device with a shim kit to correctly time device. Do not use a crush washers Available in either 1/2x36 or 1/2x28 thread pitch 1.42" long 0.8 oz