I have a 20" HB Free floated via Yankee Hill quad rail 1/9 upper. Yankee Hill gas block and fold down front sight. ARMS extended SWAN sleeve, Badger Tac charging handle with bolt and carrier. I have about 500 rounds through this. All work done by Bushmaster. Some scratches on bottom rail foremost postions. Overall condition is very good.
I've shot .75 at 100 with Winchester white box and I was banging steel (well not banging but tinking it) at 1k with 39 MOA and 55gr white box.
Will sell for $650 shipped CONUS. Will take a Aimpoint M3 with 2 MOA as partial Aimpoint can be used.
Not really looking for anything else in trade but if you have something in mind it doesn't hurt to ask.http://i20.photobucket.com/albums/b245/BigAmericanMan/ARUpper.jpg