AR-15 16\" M4 Contour Barrel, 5.56 NATO 1:7, Parkerized

Premium Grade AR-15 Barrel 16\" M4 Contour, W/ 1:7 Twist, 5.56 NATO, Carbine Length, Parkerized Carbine gas system, with .07 gas port, .750 gas block diameter, and threaded for comp. Barrel extension installed with M4 feed ramps. 100% American made. Barrels are manufactured from two types of steel. 4150 Gun Quality Steel, Heat Treated to RC 28-32 Hardness, and Stress Relieved. 416 Stainless Steel, Heat Treated to RC 28-32 Hardness, and Stress Relieved. They are Drilled, Reamed, Rifled, Turned, a