Alexander Arms Upper Receiver Build Kit AR-15 50 Beowulf 16.5″ Barrel 49/64″-20 Thread Black


Category: Product ID: 18997


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, dowel pins, gas tube, 16.5″ threaded barrel, thread protector, complete bolt carrier group with bolt, and of course one seven 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 16.5″ 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
  • Dowel pins
  • Gas tube
  • 16.5″ threaded barrel
  • Thread protector
  • Complete BCG with bolt
  • One 7 Round Magazine
  • Product Information

    Cartridge 50 Beowulf
    Finish Black
    Material Aluminum
    Barrel Length 16.5 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 Mid-Length
    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 4.715 Pounds


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