Armalite AR-50 (USA)

Caliber: .50BMG (12.7x99 mm)
Operation: bolt action, single shot
Overall length: 1499 mm
Barrel: 787 mm (31" tapered, 8 groove rh 1:15 inch twist)
Weight: 18.61 kg
Muzzle device: cylindrical multiflute recoil check