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The MG 151/20 is a belt-fed 20 mm aircraft cannon designed by Mauser for the Luftwaffe. The MG 151 programme began in the mid-1930s. Production started in 1940 with a 15 mm version, the MG 151/15. In 1941 the design was rechambered for a new 20×82 mm cartridge, which gave a heavier explosive shell at lower velocity. Conversion needed mainly a new barrel and minor changes, and the 20 mm gun became the standard weapon. It was used as wing, fuselage or engine-mounted armament on fighters such as the Bf 109 and Fw 190, and on night fighters, bombers and ground-attack aircraft. It was also fitted to Italian and Romanian types and supplied to Japan. The gun is a recoil-operated automatic weapon. Two ignition versions exist: early guns with percussion priming and later E-models with electric priming, which suited synchronised installations. Collectors identify the type by its designation, such as MG 151/20, on the barrel and receiver, plus the serial number and the maker's and acceptance codes. The 15 mm and 20 mm guns are distinguished by barrel and chamber. The MG 151 should not be confused with the separate 13 mm Rheinmetall MG 131.
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