French Reibel M.A.C. 31 tank machine gun with side mounted 150 round
MAC 31 F Modèle 1931 (Montpellier)
Mac 1934 T
. Fiat-Revelli M1914/35. 
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The first version, terrestrial, the MAC 31 
Personal photo - Musée des invalides. 
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FIAT-Revelli M1914 and M1914/35 machine gun
Caliber M1914 - 6.5x51 M91, caliber M1914/35 - 8x59 M35. The body of the M1914 machine gun without water weighs 17 kilograms and the weight of the mount is 22.4 kilograms. The body of the M1914/35 machine gun weighs 18.1 kilograms without water with a machine weight of 23 kilograms. The length of the barrel of the M1914 is 654 millimeters with an overall length of 1180 millimeters. The length of the barrel of the M1914/35 is 653 millimeters with an overall length of 1270 millimeters.
The M1914 fires 400 rounds per minute, the M1914/35 - 500 rounds per minute. In 1914, with the outbreak of the First World War, the Italian Army adopted a water-cooled heavy machine gun with a 6.5 mm caliber barrel designed by Reveli with the index Mitragliatrice M1914. In 1935, Italy adopted the 8x59 M35 caliber, also known as the 8 mm Breda.
Along with this caliber, a new Fiat M1935 machine gun was also adopted, which was a conversion of the Fiat-Revelli M1914 machine gun for a new caliber and for a new power system. The Fiat designers abandoned the water-cooled barrel, preferring a quick-change air-cooled barrel. The M1914’s cassette magazines were replaced by a more traditional tape supply. But the design itself with a not very successful locking system and with a specific reloading mechanism, which the soldiers called a “finger breaker” or “brass knuckles”, remained unchanged. The service life of these machine guns was short, and they left the world armament scene after the end of World War II.
The M1914 was fed from multi-row original open-type magazines, which were ten open box single-row magazines with 5 rounds in each combined into one block. The M1914/35 was fed from non-loose metal belts, while the belt could be fed both from the right and from the left.
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