The Alexander Arms KIT50 Upper Parts Kit for 50 Beowulf delivers a ready-to-build upper with a 16" black finish barrel featuring a 1:20 twist and 49x64-20 TPI threads with thread protector, paired with a complete upper receiver, charging handle, gas block, dowel pins, gas tube, and a full BCG with bolt, plus a 7-round magazine to get your semi-automatic AR-15 platform firing 50 Beowulf from the moment you assemble. This semi-complete upper is designed for users who want to simplify the upgrade process while maintaining clean, reliable operation; the 16" length supports practical field performance without excessive muzzle rise, and the 1:20 twist optimizes stability for typical Beowulf projectiles. The black barrel and receiver finish provide a cohesive look and durability suitable for range days and field use, while the included components ensure a solid fit and straightforward installation once you add a compatible handguard to complete the assembly. Ideal for DIY builds and enthusiasts seeking a dedicated Beowulf configuration on an AR-15 platform, this upper kit blends proven Alexander Arms engineering with practical compatibility, enabling a compact, high-caliber option for target practice, hog hunting, or plinking with a .50 caliber upper.