The GunTec Muzzle Brake with Slip-Over Barrel Shroud is a dual purpose unit, it functions as a barrel shroud and as a muzzle compensator. The multi ported "Gatling Gun" style compensator reduces felt recoil up to 70%. The barrel shroud portion slips over the barrel and threads down from the inside of the brake. FeaturesMulti Porting "Gatling Gun" Style Muzzle Comp Reduces Felt Recoil Up To 70 PercentSlips over Barrel And Threads OnDual Purpose Unit, Functions As A Barrel Shroud And A Muzzle Compensator