AR-15 Barrel 16" M4 Profile 5.56 NATO Carbine Gas System 1:7 Twist
AR-15 Barrel 16" M4 Profile 5.56 NATO Carbine Gas System 1:7 Twist, This 16" M4 contour profile barrel is made of 4150 chrome moly vanadium steel with a parkerized finish, a carbine length gas system with a 1:7 twist rate. The barrel is chambered in 5.56NATO and machined with M4 feed ramps in the barrel extension. 16" M4 Contour Barrel 4150 Chrome Moly Vanadium Steel Parkerized Finish 1:7 Twist 5.56NATO Caliber Carbine Length Gas System