Ballistic Advantage Classic Series 14.5-inch AR-15 barrel with carbine-length gas system. This high-quality barrel features a 1 in 7 rate of twist, bare 1/2x28 threaded muzzle, and .750" gas block journal. With its chrome lined bore and chamber, Manganese Phosphate finish, and M4 barrel profile, this machined Chrome Moly Vanadium barrel is a high-quality and durable choice for a 14.5" AR-15 build. The Phosphate coated barrel extension enhances reliability, while the 1/2x28 threaded muzzle provides shooters with the ability to install a wide range of compatible muzzle devices.Features: Machined Chrome Moly Vanadium AR-15 barrel Caliber: 5.56 NATO Finish: Manganese Phosphate Rate of twist: 1:7 Barrel length: 14.5" Gas system: carbine length Barrel profile: M4 Muzzle thread: 1/2x28 Weight: 25 oz