The Alexander Arms KIT50 Upper Parts Kits 50 Beowulf 16" Black Barrel, Aluminum Black Receiver for AR-15 is a semi-complete upper kit built around a 16" threaded barrel and aluminum flat-top receiver. Chambered in 50 Beowulf, it arrives with the barrel, complete upper, gas system, bolt carrier group, charging handle, and a dedicated 7-round magazine, giving builders a straightforward path to a hard-hitting AR-15 upper once a compatible handguard is added.

This configuration is well suited for range work, hog or large game hunting, and general big-bore AR experimentation where shooters want strong energy on target from a compact 16" upper. The optic-ready receiver makes it easy to mount your preferred sight, while the 1:20 twist and 49/64-20 threaded muzzle with protector support typical 50 Beowulf loads and future muzzle device options. It reflects Alexander Arms’ role as the originator of the 50 Beowulf concept and their focus on reliable, purpose-built AR platforms.

Key Features:

• Manufacturer: Alexander Arms
• Model: KIT50 Upper Parts Kit
• Caliber: 50 Beowulf
• Condition: New
• Action: Semi-Complete Upper Kit
• Barrel Length: 16"
• Number of Magazines: 1
• Capacity: 7
• Threaded Barrel: Yes, 49/64-20 TPI With Thread Protector
• What's In The Box: Upper receiver, 16" barrel, gas block, gas tube, dowel pins, complete BCG with bolt, charging handle, 7-round magazine
• Length: 24" (approximate overall upper length)