AR-15 M4 .223/5.56 Carbine Length Kit with 16" Barrel

AR-15 M4 .223/5.56 Carbine Length Kit with 16" Barrel Specifications AR-15 carbine kit .223/5.56 bolt carrier group (U.S. made) Standard charging handle Ejection port/dust cover assembly Forward assist assembly 16" U.S. made barrel 1:7" twist Carbine length gas tube (U.S. made) Low profile gas block Muzzle brake (phantom design) 16" super slim quad rail Buffer tube Buffer spring 3.0 oz. buffer Steel end plate Steel castle nut Includes both upper and lower parts DOES NOT INCLUDE LOWER RECEIVER