Unfired except by the factory, this is a govt. profile 1/9 twist chrome lined M4 upper, with an A2 hider. Bolt, carrier, and charging handle still have factory grease on them as you can see in the third pic. Bushmaster wants $545 for an A2 and $645 for an A3. New price $475 and carry handle is included.
EDIT: Trade deal pending. Off the market as of now.