This hybrid muzzle brake reduces recoil, muzzle rise and debris by directing the blast to the sides of the muzzle. It is constructed from alloy steel for strength and durability with a black oxide finish to complement most firearms. It is timed using an external jam nut. This muzzle brake is compatible with Glenfield Rifles chambered in 450 Bushmaster. This Genuine Glenfield Factory Accessory is made in the USA.