Bravo Company M4 Upper Receiver is 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. FeaturesFully Assembled with forward assist, and ejection port coverMil-Std 1913 Rail for mounting optics and accessoriesMachined for use with barrels that use an M4 barrel extensionLaser etched T-markings for addressing the remounting of opticsIncludes Mil-Spec Forward Assist with heat treated tool steel pawl, with press fit and pinned capHard Coat Anodized per Mil-A-8625F, Type III, Class2Dry Film Lube on interior bore per Mil-Specs