Colt Forged M4 Upper Receiver Assembly Built to the correct military specifications Colt ‘M4’ marked upper. These are not ‘C’ marked. CAGE codes may be roll marked but are normally etched/dot matrix marked. Features: Precision machined to correct Mil-Specs from 7075 T6 Forgings extension, providing the user with superior strength when dropped or when mortaring malfunction clearance drills. Fully Assembled with forward assist, and ejection port cover Mil-Std 1913 Rail for mounting optics and accessories Machined for use with barrels that use an M4 barrel extension T-markings for addressing the remounting of optics Includes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned cap Hard Coat Anodized per Mil-A-8625F, Type III, Class2 Dry Film Lube on interior bore per Mil-Specs
