Alexander Arms Upper Receiver Build Kit AR-15 6.5 Grendel 20″ Stainless Steel Barrel 5/8″-24 Thread Black


Category: Product ID: 19063


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 mil-spec upper receiver (port door and forward assist installed), mil-spec charging handle, mil-spec gas block, 20″ threaded barrel, complete bolt carrier group with bolt, and of course one 10-round magazine. Chambered in 6.5 Grendel, this upper receiver kit squeezes 6.5×39 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 20″ 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.


Thread protector not included.


  • Mil-Spec flat top upper receiver (port door and forward assist installed)
  • 20″ 416R stainless steel barrel
  • Threaded 5/8-24 RH
  • Complete bolt carrier and 6.5 Grendel Bolt
  • Mid-length Gas tube
  • Mil-Spec charging handle
  • One 10-round magazine


Made In United States of America


Product Information

Cartridge 6.5 Grendel
Finish Black
Material Aluminum
Barrel Length 20 Inches
Twist 1:8 Inches
Threads 5/8″-24
Barrel Contour Standard
Sights No
Barrel Finish Stainless
Chrome Lined No
Gas Block Diameter 0.875 Inches
Gas System Length Rifle
M4 Feed Ramps No
Upper Receiver Type A4 Flat-Top
Barrel Material Stainless Steel
Bolt Carrier Assembly Included Yes
Mil-Spec or Commercial Mil-Spec
Country of Origin United States of America
Compatible With

Delivery Information

Shipping Weight 4.985 Pounds


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