Guntec USA Slip Over Barrel Shroud w/Multi Port Muzzle Brake 9mm Cal 1/2x36 Cerakote Flat Dark Earth. 2 oz Condition: New Features of Guntec USA Slip Over Barrel Shroud w/Multi Port Muzzle Brake Multi Porting Gatling Gun Style Muzzle Comp Reduces Felt Recoil Up To 70 Percent Slips over Barrel And Threads On Dual Purpose Unit Functions As A Barrel Shroud And A Muzzle Compensator Covers 4in of Barrel Extends Barrel 1.5in Package Contents: Guntec USA Slip Over Barrel Shroud w/Multi Port Muzzle Brake What firearm models does the manufacturer say Guntec USA Slip Over Barrel Shroud w/Multi Port Muzzle Brake is compatible with? The manufacturer suggests that Guntec USA Slip Over Barrel Shroud w/Multi Port Muzzle Brake is compatible with AR-15Guntec USA 1326-MB-P-9-FDE: Slip Over Barrel Shroud w/Multi Port Muzzle Brake 9mm Cal 1/2x36 Cerakote Flat Dark Earth