The Alexander Arms Beowulf is an AR-15-pattern rifle chambered in the .50 Beowulf cartridge, developed by Alexander Arms to deliver dramatically increased terminal energy from a standard AR-15 lower at close to medium range. Type: Rifle Action: Semi-Automatic Caliber: .50 Beowulf Capacity: 7 Year introduced: 2001, USA Weight: 76 oz Overall length: 37" Status: Active Intended use: Hunting, Tactical