This Alexander Arms AR-15 Precision Upper Receiver comes fully assembled and ready to install on any standard small pin lower receiver. Chambered for the awesome 50 Beowulf cartridge, this upper squeezes 50 caliber firepower into a standard AR-sized envelope, offering shooters an immense step up the power scale compared to a traditional 223 Remington. With its compact and maneuverable 16.5" Barrel and Free Float Tube Composite Handguard, this precision upper configuration is perfect for use as a close- to medium-range hunting setup that's capable of taking down the largest of game. It features a Forged 7075-T6 Aluminum Flat-Top Receiver for adding optics and/or iron sights, a low profile gas block, complete bolt carrier group, charging handle, one 7-Round Magazine and an enormous Tank Muzzle Brake that decreases felt recoil upon firing by as much as 40-50 percent.
- This upper comes equipped with a Forward Assist and Brass Deflector Only. For increased reliability, the ejection port has been enlarged in order to give the larger 50 Beowulf cartridge cases room to eject. As modified, this upper does not accommodate or include an ejection port door.
- Barrel diameter under the handguard is 0.980", tapers to 0.907" under the gas block, and finally tapers down to 0.775" at the muzzle. The Low Profile Gas Block is proprietary to the barrel's unique 0.907" Outside Diameter.
- Due to the 50 Beowulf's recoil, use of a Fixed Stock or Durable Collapsible Stock such as a MagPul UBR or ACE Hammer is recommended.
- Upper Receiver: Modified A3 Flat-Top (No Ejection Port Door)
- Barrel Length: 16.5"
- 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: Tank Muzzle Brake
- Gas System Length: Mid
- Gas Block Diameter: 0.907"
- Handguard: G10 Composite Tube, Free Float
- Sights: None
- Bolt Carrier Assembly Included: Yes
- Bolt Carrier Type: 50 Beowulf Compatible Carrier
- Includes Low Profile Gas Block, 7-Rnd Magazine
- Weight: 4.75 lbs
- Upper does NOT have an ejection port door
Please Note: Installation of AR-15 upper assemblies with certain features including, but not limited to: flash hiders, bayonet lugs, and threaded muzzles may violate state and/or local laws.