The Mosin Nagant 91/30 tanker muzzle brake features heavy duty heat treated steel construction with Military style corrosion resistant black oxide finish. The Mosin Nagant 91/30 tanker muzzle brake reduces the rifle recoil felt punch and helps eliminate muzzle rise. Easy bolt on design locks in place with two top bolts and steel clamp ring there are three steel set screws one on the bottom and each side for a rock solid hold. Length is approximately 3.74 inches width is 1.37 inches. Material solid steel with CNC Construction.