- Upper Receiver: Modified A3 Flat-Top (No Ejection Port Door)
- Barrel Length: 12"
- Barrel Contour: Heavy, Tapered
- Barrel Material: Chrome Moly Vanadium Steel
- Muzzle Thread Pattern: 49/64"-20
- Chrome Lined: No
- Barrel Finish: Parkerized
- Twist Rate: 1 in 20"
- Chamber: 50 Beowulf (12.7x42mm)
- M4 Feed Ramps: No
- Muzzle Device: Pepper Pot Muzzle Brake
- Gas System Length: Carbine
- Gas Block Diameter: 0.907"
- Handguard: 2-Piece Polymer w/Heat Shield, M4-Style
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: 50 Beowulf Compatible Carrier
- Extras: Single Rail Gas Block, 7 or 10-Round Magazine
- Weight: 4.8 lbs
- Upper does NOT have an ejection port door
Please Note: An “AR-15 Pistol” upper assembly has a barrel less than 16” in length. Pistol uppers are only for use on AR-15 pistol lowers and legal Short-Barreled Rifles. Other configurations may violate Federal law.
Alexander Arms supplies either a 7 or 10-Round magazine with this upper receiver assembly. Sorry, no choice in magazine. Not available in areas where 10-round magazines are prohibited.