Colt Firearms 16.1" AR-15 5.56 Carbine Complete Upper Receiver

The Colt Upper Receiver Assembly feature's Colt's upper receiver. This upper receiver allows for a free-floated barrel and also features a gas-block mounted fixed front sight post with bayonet lug and a backup rear sight. The barrel is Colt's standard 16.1? chrome lined M4 barrel with an A2 flash hider up front.