PPSh-41

The PPSh-41 (pistolet-pulemyot Shpagina; Russian: Пистолет-пулемёт Шпагина; "Shpagin machine pistol"); is a Soviet submachine gun designed by Georgi Shpagin as a cheap, reliable, and simplified alternative to the PPD-40. Common nicknames are "pe-pe-sha" from its three-letter prefix and "papasha" (Russian: папаша), meaning "daddy". The impetus for the development of the PPSh came partly from the Winter War against Finland, where the Finnish Army employed the Suomi KP/-31 submachine gun as a highly effective tool for close-quarter fighting in forests and built-up urban areas. A submachine gun, the PPD-40, was subsequently rushed into mass production in 1940, but it was expensive to manufacture, both in terms of materials and labor, because it used numerous milled metal parts, particularly its receiver. Shpagin's main idea for cost reduction was to use metal stamping for the production of most parts; that concept was revolutionary in the Soviet Union at the time. Shpagin created a prototype PPSh in September 1940, which also featured a simple gas compensator designed to prevent the muzzle from rising during bursts; this improved shot grouping by about 70% relative to the PPD.