16" Chrome Moly Phosphate M4 Carbine 5.56 Barrel 1x9 Twist
AR-15 M16" Chrome Moly Barrel 1/8 TwistSpecifications:Profile - M4 Carbine 16" - Chamber/Bore - Chrome Moly 5.56MM - Barrel Thread - 1/2 x 28 - Barrel Twist - 1x8 - Barrel Steel - 4150 Chrome Moly Steel - Barrel Finish - Black Nitride - Gas System - Carbine length with .750" gas block  platform (gas port hole is drilled) - Feed Ramp - M4 Feed Ramps - MADE in the USA