Alexander Arms KIT50 Upper Parts Kit | .50 Beowulf

The Alexander Arms KIT50 is a semi-complete upper parts kit designed for use on AR-15 platforms chambered in .50 Beowulf. The kit supplies a complete upper receiver assembly along with a bolt carrier group and common upper components, intended for builders finishing a big-bore upper. This kit ships with an aluminum receiver finished in black and includes a threaded barrel with a removable thread protector; a handguard is required to complete installation.

Typical applications include big-game hunting setups and range or accuracy work built around a heavy-caliber AR-15 upper. This kit is for experienced builders and gunsmiths who will supply a compatible handguard and complete final assembly.

Product Specifications

• The kit type is listed as Semi-Complete and is intended to form the basis of an upper assembly.
• The cartridge is specified as .50 Beowulf.
• The rate of twist is listed as 1:20.
• The receiver finish is listed as black.
• The barrel finish is listed as black.
• The thread pattern is 49/64-20 tpi and includes a thread protector.
• The material for the receiver is listed as aluminum.
• The kit is designated as a Kit in the manufacturer series.
• The item is intended to fit AR-15 platforms.
• The kit includes a complete BCG with bolt and a charging handle.
• The package includes one 7-round magazine as noted in the product information.
• The listing states that a handguard is required to complete the upper assembly.
• The product is described as an AR-15 accessory.
• The listed dimensions are 4.35 X 4.60 X 28.65 as provided.
• The weight is listed as 4.79 in the provided data.
• The UPC is 819511021059.

This KIT50 upper parts kit provides the core components needed to assemble a .50 Beowulf upper on an AR-15 receiver. It packs the essential hardware—receiver, BCG, charging handle, gas system parts, threaded barrel with protector and a magazine—into a single package for builders who want to create a heavy-bore sporting upper while choosing their preferred handguard and finishing components.