Premium lightweight AR-15 carbine barrels manufactured to Brownells specifications. Barrel crafted from 4150 Chrome Moly Vanadium with a hard chrome bore and chamber. Features 223 Wylde chamber suitable for both 223 Remington and 5.56x45 NATO, 1:8 twist, phosphate finish, and 1/2-28 muzzle threads. .625 gas block journal and M4 feedramps interface with upper receivers. Ballistic Advantage manufactures these to Brownells specifications and quality standards.