The Clamp On Muzzle Brake for the Mosin Nagant is dipped in a black oxide bath and then coated in KG Ceramic Gunkote for a hard and durable finish. Made for non threaded barrels. Recoil is reduced a minimum of 60%, muzzle rise and dust signature are eliminated. High quality precision machined muzzle device. Clamps onto the first one inch of barrel. Front sight must be removed.