This Midwest Industries AR-15 Upper Receiver Assembly features a lightweight barrel and free floated handguard. The MI Combat Rail M-Lok Handguard features a patented 4140 heat treated torque plate with 6061 aluminum type 3 hard coat anodizing. It includes a continuous mil-std 1913 picatinny top rail with two integral anti-rotation QD sling sockets. It also includes 7 sides of M-Lok and is fully dehorned and deburred. This upper will need a bolt carrier group and charging handle to be completed. FeaturesForged 7075 T6 Aluminum UpperHard Coat AnodizingT-Markings on ReceiverLightweight Melonite Finish Barrel0.625" Gas Block DiameterMid-Length Direct Impingement Gas SystemMI-CRM14" Combat Series M-LOK HandguardMI A2 Flash Hider