MG-08 (Maschinengewehr-08): This was the German Army's standard machine gun in World War I and served as a heavy machine gun during WW2 by Wehrmacht Heer. By the end of WW2 it had been relegated to second-rate fortress units. Firing rate averages 500 rounds per minute for the Schloss 08 and 600 rounds per minute for the Schloss 16. It used 250-round fabric belts of 7.92mm×57mm ammunition. It was water-cooled, using a jacket around the barrel that held approximately one gallon of water.