The Alexander Arms .50 Beowulf Upper Receiver (brand part no. SBR50) pairs a 12-inch threaded chrome barrel with an AR-15-compatible upper, chambered in .50 Beowulf for shooters who want big-bore stopping power on a familiar AR platform. Alexander Arms cuts the barrel with a 1:20 twist rate, tuned for the heavy, straight-walled .50 Beowulf cartridge, and treats it with a ferritic nitrocarburizing process the company calls LIFE Process, increasing surface hardness and wear resistance over a standard finish. The upper ships complete with a bolt carrier group, and the threaded muzzle accepts a compensator or other muzzle device. This is an AR-15 platform upper receiver sold on its own, without a lower receiver or stock included, and it’s built to install onto any compatible mil-spec AR-15 lower a builder already owns.

Key Specifications

• Chambered in .50 Beowulf.
• Barrel measures 12 inches.
• Rifling uses a 1:20 twist rate, tuned for the heavy .50 Beowulf bullet.
• Barrel material is chrome.
• Finished with a ferritic nitrocarburizing (LIFE Process) treatment for hardness and wear resistance.
• Muzzle is threaded for a compensator or muzzle device.
• Ships complete with a bolt carrier group.
• Compatible as an AR-15 platform accessory upper.
• Installs on any compatible mil-spec AR-15 lower receiver.

Frequently Asked Questions

Does this upper include a lower receiver? No, this is an upper receiver only, without a lower receiver or stock; it’s built to install on a compatible AR-15 lower supplied by the builder.

Does this upper come with a bolt carrier group? Yes, it ships complete with a bolt carrier group.

What does the LIFE Process finish do? It’s a ferritic nitrocarburizing treatment that increases the barrel’s surface hardness and wear resistance compared to a standard finish.

Buy the Alexander Arms .50 Beowulf Upper Receiver, 12-inch Threaded, Black

Add big-bore .50 Beowulf capability to your AR-15 build. Order it through our Alexander Arms lineup of AR15 uppers, and we’ll get it ready to ship as soon as it’s available from our Lubbock, Texas gun shop.