Brand new complete upper, excellent piston drive carbine length system, chambered in 5.56 NATO, 1:7 twist. Only been test fired to verify everything is good to go. Has polymer backup sights (front and rear) installed on the rails. This is exactly the upper (without the sights of course): $675 cash OBO. Local sale only, not interested in any trades. Thank you. I can install a combination compensator/flash hider, instead of the stock A2 flash hider, for an extra $50 if the buyer is interested.