The Russian Imperial Army's adoption of the Maxim water-cooled machine gun, produced domestically as the PM M1910. The definitive machine gun of WWI and WWII for Russian/Soviet forces, mounted on a distinctive Sokolov wheeled carriage. Type: Rifle Action: Full-Auto Caliber: 7.62x54mmR Year introduced: 1910, Russia Status: Discontinued Military use: Yes Intended use: Military, Collecting