Colt's Manufacturing, Complete Upper Receiver, 223 Rem/556NATO, 16.1" M4 Barrel, Black Finish, A2 Fixed Front Sight, Magpul BUIS Rear SightCOLT M4 UPPER 5.56 16.1" LE6920CKSKU: LE6920CK$765.00PriceQuantityOut of StockNotify When Available