2A Armament is proud to offer our own branded lightweight pencil barrel. These barrels are made in specialized factories and are the same barrels that ship with the BLR-16 rifle. Specifications for 2A Armament Lightweight Barrel: Manufacturer: 2A Armament Color: Black Finish: QPQ Nitride Fabric/Material: 416-R Stainless Steel Caliber: .308 Winchester Barrel Length: 18 in Barrel Profile: Light Weight Gas System Length: Rifle Length Gas Block Journal Size-Diameter: .750 in Threads per Inch: 5/8x24 Barrel Twist Rate: 1-10 Barrel Material: 416R Stainless Steel Flutes: No Weight: 2.23 oz Gas Block Journal Size-Length: 1 in Gas Port Size: 0.081 in Features of 2A Armament Lightweight Barrel 11 deg target crown Magnetic Particle Inspected Package Contents: 2A Armament Lightweight Barrel