The Angstadt Arms 3-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! FeaturesMade from hardened steel with a black nitride finishInstall muzzle device with a shim kit (sold separately) to correctly time deviceDo not use a crush washer