Windham Weaponry .223 Rem/5.56 16" Barrel Complete Upper Receiver Assembly w/ Handle - UR16A4B
- Handguard: M4 Black Synthetic
- Caliber: 223 Remington/5.56x45mm NATO
- Barrel Type: Heavy
- Barrel Length: 16"
- Barrel Material: 4150 Steel
- Twist Rate: 1:9"
- Muzzle Type: A2 Flash Suppressor
- Receiver Type: A3
- Receiver Finish: Black
- Barrel Finish: Black
This complete heavy barrelled upper assembly includes a 16 inches heavy profile barrel of chrome lined, 4150 Chrome Moly Vanadium 11595E steel, rifled 1:9 inches R.H.T., an A2 flash suppressor, A2 front sight, M4 handguards, and the aluminum flat top Upper Receiver complete with bolt, bolt carrier assembly, charging handle, forward assist, ejection port cover, and removable A4 carry handle with 300 to 600 m dual aperture rear sight.