A2 Upper Receiver with A2 rear sight cut, Stripped The A2 Upper Receiver, carry handle style, complete with cuts for mounting A2 rear sight (windage and elevation). Features shell deflector, forward assist housing, and provisions for installing an ejection port cover. Precision machined from a premium-grade 7075 T6 aluminum forging and hardcoat anodized for extra strength. Does Not feature M4 Style Cuts. SPECIFICATIONS: Caliber - .223 Rem, .556 mm Material - 7075-T6 Aluminum Forging Finish - Hard Coat Anodized Mfg: Luth-Ar