Windham Weaponry .223 Rem/5.56 16" M4 Profile Barrel Complete Upper Receiver Assembly - UR16M4A4B
- Handguard: M4 Black Synthetic
- Caliber: 223 Remington/5.56x45mm NATO
- Barrel Type: M4 Profile
- 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 16 inches M4 Profile barrelled upper assembly from our popular MPC carbine, is complete and ready to snap onto your Lower Receiver. The highly accurate 16 inches M4 barrel is machined from 4150 Chrome Moly Vanadium 11595E steel - rifled 1:9 inches right hand twist, and chrome lined for long wear and easy cleaning. An A2 flash suppressor and standard A2 front sight are fitted, and the machined aluminum flat top Upper Receiver is 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.