12.5" BA, BCM, For use with OCM5 or AEM5

12.5" 5.56 Government Profile Carbine Length AR 15 Barrel, Modern Series Colt "T" marked upper BCM PIC RAIL Allen Engineering collar and muzzle brake (Timed & Rockset) CrMoV steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension. Aero Precision Nitride Complete BCG and charging handle Nitride Gas Block pinned to the barrel (MilSpec) Carbine Gas Tube ERGO "Black" low profile Picatinny Rail Covers You can use Otter Creek Lab's OCM5 or Allen Engineering AEM5, AEM5K, AEM5 30k, AEM5 30 Colt SBR and Silencer NOT included