Barrel

Combat Armory Barrel 16" 4150 Parkerized M4 Contour Barrel 5.56 NATO Carbine Length Gas System w/ 1:8 Twist

Product Specs Length 16 Profile Contour Twist 1:8 Finish Parkerized Material 4150 Chrome Moly Vanadi

Combat Armory 7.5" 5.56 NATO 1:7 Pistol Length AR-15 Barrel

Combat Armory Manufacturing  Barrel Coating Parkerized Barrel Contour M4 Barrel Length 7.5