The BattleComp 1.5 Matte Stainless will fit all barrels with 1⁄2 x 28 RH standard threads. The BC1.5 has the same performance as the BC1.0, but the BC1.5 has been extended and pre-drilled for permanent attachment to 14.5″ barrels needing 16.1″ overall length. Specifically designed for 5.56 NATO and .223 Rem ammunition. Crush washer include