20" Black Nitride 5.56 NATO Government Barrel

20" Black Nitride 5.56 NATO Government Barrel This 20" 5.56 NATO Government Profile AR 15 Barrel is American-made using 4150 Chrome Moly Vanadium Barrel steel and features a Black Nitride treatment for added strength and durability. These AR-15 barrels are rifle-length gas and dimpled for a .750 AR-15 gas block. Features 5.56 NATO Caliber 20" Government Barrel Black Nitride Finish 1:7 Twist 1/2x28 Muzzle Thread Pattern Rifle Length Gas System 1 MOA Guarantee using properly weighted match gade factory ammo and shooting from a rest