Type 99 light machine gun

The Type 99 light machine gun (九九式軽機関銃, Kyūkyū-shiki Kei-kikanjū) is a light machine gun used by the Imperial Japanese Army in World War II. It was similar in design to the earlier Type 96 light machine gun, but designed to fire the new and more powerful 7.7×58mm Arisaka cartridge, which improved energy by over 50%. Other improvements included the omission of the oiling mechanism which resulted in a better all-round weapon.

Source: Wikipedia — Type 99 light machine gun (CC BY-SA 4.0)