Bcm 4Urm4 Bcm M4 Upper Assembly Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver For Ar-15 BCM4-UR-M4

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. 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. As with all BCM products, Made in the U.S.A.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 Laser etched T-markings for addressing the remounting of optics

Specifications