This Upper receiver is available stripped or assembled with an Ejection Port Cover and Forward Assist Assembly, and ready for a new barrel. CNC Machined from 7075T6 Aircraft Aluminum, this quality Upper is finished in Hard Black Anodize for a non-reflective matte surface and protection against corrosion. It features an integral Picatinny Rail that will accept a wide variety of Rear Sights, Optics, or the A4 Removable Carry Handle.