The Alexander Arms .50 Beowulf DIY Upper Kit (brand part no. KIT50) puts big-bore power on an AR-15 lower with a build-it-yourself parts package from the cartridge’s original developer. Alexander Arms includes a complete upper receiver, a 16-inch threaded barrel in black with a thread protector, a complete bolt carrier group, the gas block, gas tube, and dowel pins — everything except the handguard, so builders can choose their own. The 1:20 twist stabilizes heavy .50 Beowulf bullets built for short-range authority on hogs, deer, and defensive use. Among AR-15 uppers, this kit favors builders who want to assemble a big-bore upper with their preferred rail.

Key Specifications

• The chambering is .50 Beowulf, Alexander Arms’ own big-bore AR cartridge.
• The barrel measures 16 inches, threaded with a thread protector installed.
• The rate of twist is 1:20, matched to heavy .50 caliber bullets.
• Includes a complete upper receiver and complete bolt carrier group.
• Includes the gas block, gas tube, and dowel pins.
• Ships with no handguard, letting the builder pick the rail.
• The barrel is finished in black.

Frequently Asked Questions

What do I need to complete this upper? A handguard of your choice — the receiver, barrel, gas system, and bolt carrier group are all included.

Will this work on my standard AR-15 lower? The .50 Beowulf platform is designed to run on standard AR-15 lowers with the correct magazines.

Buy the Alexander Arms .50 Beowulf Upper Kit

Big-bore AR power with your choice of handguard is exactly what this Alexander Arms kit delivers. Order it from our Lubbock, Texas gun shop and it ships fast to your door.