Proof Research AR Style Barrel Features The Proof Research AR Style barrel wraps a match-grade steel liner in a carbon fiber sleeve cutting weight by up to 64 percent compared to a traditional steel barrel while maintaining the same accuracy standards precision shooters expect. This weight savings moves the rifle s balance point rearward making it faster to swing and easier to hold steady on target for extended periods. The carbon fiber wrap also improves heat dissipation helping the barrel shed heat faster during rapid strings of fire and reducing the harmonic vibration that can shift point of impact. A 1:7.5 twist rate stabilizes a wide range of 6mm ARC bullet weights for consistent downrange performance. Machined with a rifle-length gas system and a .750 inch gas journal diameter this barrel is built to integrate cleanly into a standard AR-15 platform build. The 5/8x24 threaded muzzle accepts standard 6mm-caliber muzzle devices giving builders flexibility in brake or suppressor selection. At just over 2 pounds the barrel keeps the completed rifle s overall weight down without compromising the durability Proof Research barrels are known for. For AR-15 shooters chasing match-grade accuracy with reduced heft this carbon fiber barrel delivers exceptional durability and unprecedented performance. Proof Research AR Style Barrel Specifications Manufacturer: Proof Research Model: AR Style Compatible Hosts: AR-15 Caliber: 6mm ARC Barrel Material: Carbon Fiber Barrel Length: 20 Twist Rate: 1:7.5 Gas System Length: Rifle Length Gas Journal Diameter: .750 Thread Pattern: 5/8x24 Color: Carbon Fiber Weight: 2.06 lbs Available At: GrabAGun