New BCA forged standard charging Receiver/BCG combo! This forged upper fits any Mil-spec lower receiver. This combo includes a BCA standard rear charging BCG, a rear charging handle, and the forged upper receiver with forward assist and dust cover. This combo is perfect for an ergonomic and unique work horse build. M4 Flat Top Upper Receiver Standard Rear Charging Made from 7075 Aircraft Aluminum .223 WYLDE / 5.56 NATO Caliber / .300 Blackout / .350 Legend Anodized Black