This 1-piece Krinkov style muzzle brake is made of an all steel construction with a heat treated, erosion resistant, black oxide finish. It comes with a 1/2"x28 thread pitch, and is designed to reduce recoil along with barrel whip.1-piece Krinkov style muzzle brake is made of all steel construction with a heat treated, erosion resistant Black oxide finish. It comes with a 223/.556 1/2-28 thread pitch. Reduces recoil and barrel whip. Features: USA made