Purchased from site dealer for lower I picked up,ended up with a 16'' M4 upper and used it instead.Unit is as new,99% and maybe unfired( I never fired ).Complete with Colt bolt,Colt carrier,shorty handguards,A2 sights. A2 flash hider,no bayonet lug. Small pin configuration. Forward assist,ejection cover.CMP marked 1/7 Nato barrel.Half-circle bolt carrier. If you are looking for a super nice lightweight upper this is it,all Colt. $ 625. shipped to you,lower 48.Thanks for looking and yes,I can email pics if really interested.