This Upper comes assembled with an Ejection Port Cover and Forward Assist Assembly, and is 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 Mil-Std-1913 Rail that will accept a wide variety of rear sights, optics, or scopes. Available as a Complete kit or Stripped.