This tri-lug flash hider 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 flash hider 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 Does not require the use of shims. Shims can be used if specific timing is desired. Do not use a crush washer 1/2×36 thread pitch 1.42″ long 0.7 oz