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MP40
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| backgroundinfo =The MP 40 was a submachine gun chambered for the 9×19mm Parabellum cartridge. It was developed in Nazi Germany and used extensively by the Axis powers during World War II.Designed in 1938 by Heinrich Vollmer with inspiration from its predecessor the MP 38, it was heavily used by infantrymen, paratroopers, platoon and squad leaders on the Eastern and Western Front. Its advanced and modern features made it a favorite among soldiers and popular in countries from various parts of the world after the war.The MP 40 submachine guns are open-bolt, blowback-operated automatic arms. The only mode of fire was fully automatic, but the relatively low rate of fire enabled single shots with controlled trigger pulls.The MP 38 receiver was made of machined steel, but this was a time-consuming and expensive process.To save time and materials, and thus increase production, construction of the MP 40 receiver was simplified by using stamped steel and electro-spot welding as much as possible. The MP 38 also features longitudinal grooving on the receiver and bolt, as well as a circular opening on the magazine housing. These features were eliminated on the MP 40.<ref name= "wiki"></ref>
| trivia =
*The experimental version of MP40 has 2 magazine housings, allowing operators to switch to another magazine without re-insert a fresh magazine by pressing the latch at the front of magazine housing, called MP40/I. This however, MP40/I was cancelled for entering a service or simply further test. The weight of MP40 became 12 pound heavier over the normal one, and the vulnerability of jamming was the reason of the cancellation.<ref>[https://www.forgottenweapons.com/submachine-guns/mp40i-dual-mag/ MP40/I, the dual-magazine MP40]</ref>
*Her name was MP38 in official art before changed as MP40 a years ago.<ref>[https://pbs.twimg.com/media/CHLdLtOUgAAkzIs.png:orig An early official art of MP40]</ref>
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