This is an upper receiver that Daniel Defense produced for a military contract. They had an overrun and have made them available to the public. This one is was bought a few months ago and has only been to the range once. It is a top quality military grade upper with a cold hammer forged and chrome lined 11.5 inch barrel. Comes complete with the DD bolt carrier group, charging handle, rear sight, and vertical forward grip. Drop this beauty on your favorite lower with pistol brace and you're ready to go.