Guntec USA AR .308 Mini Slip Over Barrel Shroud w/Multi Port Muzzle Brake Black. The goal is to distribute excellent quality at an economical value. Specifications for Guntec USA AR Mini Slip Over Barrel Shroud w/Multi Port Muzzle Brake: Manufacturer: Guntec USA Caliber: .308 Winchester Finish: Anodized Fabric/Material: T6 Aluminum Threads per Inch: 5/8x24 Outer Diameter: 1.1875 in Length: 3 in Weight: 2.9 oz Condition: New Diameter: 1.1875 in Features of Guntec USA AR Mini Slip Over Barrel Shroud w/Multi Port Muzzle Brake New Micro design. Covers 1 3/8in of the Barrel. Threads begin approx 1.25in down the shroud. Dual purpose unit functions as a Barrel shroud and a muzzle compensator. Slips over barrel and threads down from the inside. Multi porting Gatling Gun style muzzle comp reduces felt recoil up to 70 percent. Designed for use on AR pistols. Package Contents: Guntec USA AR Mini Slip Over Barrel Shroud w/Multi Port Muzzle Brake Guntec USA 1326-MB-P-MINI-308: AR .308 Mini Slip Over Barrel Shroud w/Multi Port Muzzle Brake Black