The Various Soviet State Arsenals Berezin UB 12.7mm Aircraft is a soviet union-made full-auto hmg chambered in 12.7x108mm, introduced in 1941. Primary use: military. Type: Machine Gun Action: Full-Auto Caliber: 12.7x108mm Capacity: 250 Year introduced: 1941, Soviet Union Weight: 128 oz Overall length: 48" Status: Discontinued Military use: Yes Intended use: military