Rheinmetall-Borsig

The MG 15 is a German air-cooled machine gun designed for flexible mounting on World War II aircraft. Developed by Rheinmetall, it was adapted from the MG 30 design. The MG 15 fires the 7.92x57mm Mauser round from either a 75-round saddle drum or a 250-round belt. It has a distinctive large air-cooled barrel jacket with cooling slots. After the war, the MG 15 was adapted for ground use by several countries.

The MG 131 is a German 13x64mm aircraft machine gun developed by Rheinmetall-Borsig for the Luftwaffe. It was designed to provide greater firepower than rifle caliber machine guns while being compact enough for fighter aircraft installation. The weapon was electrically fired on fixed mounts and mechanically fired on flexible mounts. It served as standard armament on many German aircraft from 1940 through the end of World War II.