Alexander Arms Upper Receiver Build Kit AR-15 Pistol 50 Beowulf 12″ Barrel 49/64″-20 Thread Black


Category: Product ID: 19060


The Alexander Arms AR-15 Upper Receiver Build Kit is the perfect kit for anyone wanting to create a one-of-a-kind AR-15. The Upper Receiver Built Kit comes with key components such as a complete upper receiver, charging handle, gas block, 12″ threaded barrel, complete bolt carrier group with bolt, thread protector, and of course one 7-round magazine. Chambered in 50 Beowulf, this upper receiver kit squeezes 50 caliber firepower into a standard AR-sized envelope, offering shooters an immense step up in power compared to a traditional 223 Remington. This Upper Receiver Kit is an excellent choice for a do-it-yourselfer who enjoys custom work and mix-and-matching components to find out what works for them. The upper receiver kit works great for close-to medium-range hunting or home defense with its 12″ barrel for tight spaces, and reasonably light weight construction. The upper receiver assembly features a forged 7075-T6 aluminum flat-top receiver matte black finish.


  • Complete upper receiver
  • Charging Handle
  • Gas block
  • 12″ threaded barrel
  • Thread protector
  • Complete BCG with bolt
  • One 7-Round Magazine

Product Information

Cartridge 50 Beowulf
Finish Black
Material Aluminum
Barrel Length 12 Inches
Twist 1:20 Inches
Threads 49/64″-20
Barrel Contour Standard
Sights No
Barrel Finish Black
Chrome Lined No
Gas Block Diameter 0.875 Inches
Gas System Length Carbine
M4 Feed Ramps No
Upper Receiver Type A4 Flat-Top
Barrel Material 4140 Chrome Moly Steel
Bolt Carrier Assembly Included Yes
Muzzle Device Thread Protector
Mil-Spec or Commercial Commercial
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight 4.145 Pounds


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