Guntec USA AR .308 Slip Over Barrel Shroud w/Multi Port Muzzle Brake Purple. The goal is to distribute excellent quality at an economical value. Specifications for Guntec USA AR .308 Slip Over Barrel Shroud w/Multi Port Muzzle Brake: Manufacturer: Guntec USA Caliber: .300 AAC Blackout .308 Winchester Finish: Anodized Fabric/Material: T6 Aluminum Threads per Inch: 5/8x24 Outer Diameter: 1.1875 in Length: 5.5 in Weight: 3.3 oz Features of Guntec USA AR .308 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. Package Contents: Guntec USA AR .308 Slip Over Barrel Shroud w/Multi Port Muzzle Brake Guntec USA 1326-MB-P-308-PURPLE: AR .308 Slip Over Barrel Shroud w/Multi Port Muzzle Brake Purple