Colt AR-15 14.5″ M4 Upper Receiver Assembly – 5.56x45mm / .223 Remington
This is a Colt 5.56 NATO upper receiver assembly with a 14.5″ double chrome lined M4 government-profile barrel. The 14.5″ barrel features the older colt “C MP” markings, a 1/7 twist, m4 feed ramps, carbine gas system with a shaved-down low-profile gas block. This upper receiver is brand new from Colt, barrel is unfired. (aside from factory testing).
This upper comes assembled from the factory, all components are Colt OEM. There is NO bolt carrier group, bolt, charging handle, or handguard.
NFA rules apply!
- Colt 14.5″ M4 Upper Receiver
- Caliber: 5.56x45mm (5.56 NATO)
- Bolt Carrier: None
- Barrel Length: 14.5″ – NFA Rules Apply
- Barrel Material: Chrome Moly Vanadium Steel
- Bore: Double chrome lined
- Barrel Profile: M4 Government .750″
- Barrel Twist Rate: 1:7
- M4 Feed Ramp: Yes
- Barrel Stamp: C MP 5.56 NATO 1/7
- Threads: 1/2×28″ TPI
- Muzzle Device: Standard A2 Flash Hider
- Gas System Length: Carbine
- Handguard: None
- Upper Receiver Type: Flat top, Aluminum – allows for removable carrying handle and easy mounting of accessories
- T-Marked: Yes
- Sights: None- Flat Top/Low Profile Gas Block
- Gas Block: Low-profile with bayo lug – convert to a free float easily
- Gas Block Diameter: .750″