Colt LE6920 Complete Upper Receiver, 5.56 NATO, 16.1" M4 Barrel, Black Finish, A2 Fixed Front Sight, Magpul BUIS Rear Sight LE6920-CK
Barrel Length: 16.1"
Caliber: 556NATO/223 Remington
Type of Barrel: M4
Includes: Bolt Carrier Group and Charging Handle
Handguard: Carbine drop-in
Sights: A2 and Flip-up BUIS rear