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This is a list of small arms used during the 20th century.
FN P90 (1990–present) – Belgian personal defense weapon, a submachine gun but with a scaled down intermediate rifle cartridge
MP 18 (1918–1945) – German submachine gun, world's first widely used and successful
MP 28 (1928–early 1940s) – An improvement of the MP 18
Steyr-Solothurn MP 34 (1930–1970s) – Often called "The Rolls-Royce of submachine guns", the Steyr-Solothurn MP 34 is based on the MP 28 made from the best quality materials available at the time
MP 35 (1935–1945) – An improved submachine gun based on the MP 28
MP40 (1940–1945 in Germany) – The MP 40 is a simplified MP 38, intended to replace older, more expensive submachine guns. This particular submachine gun is widely used by Germany in World War II
Walther MP (1963–present) – Intended to rearm military and police forces positioned in West Germany, also used by the German Intelligence Service and some American troops stationed in the region
HK MP5 (1966–present) – the most widely used submachine gun of the later half of the 20th century
UZI (1954–present) – Israeli submachine gun, one of the first designs to implement a system to accommodate the magazine in the pistol grip
Sten (1941–1960s in UK) – British submachine gun used extensively throughout World War II
Sterling submachine gun (1944–present) – Designed as a replacement for the Sten in 1945 but only started its process in the 50s
PPD-40 (1935–45) – The submachine gun used by the Russians before the implementation of the PPSh-41
PPSh-41 (1941–1960s in USSR) – Russian submachine gun distinctive for its high rate of fire
PPS (1942–1960s in USSR) – Family of submachine guns used alongside the PPSh family
Thompson submachine gun (1938–1971 in USA) – Family of submachine guns designed in 1910 and onwards, The Thompson is a famous submachine gun commonly associated with American gangsters
M3 submachine gun (1943–present) – A cheaper and lighter alternative to the Thompson submachine gun
MAC 10 (1970–present) – Family of submachine guns, famous among media for their association with gangs
American 180 (Designed in the 1960s, never implemented) – Chambered in 22 LR. It was described as being a "swarm of angry bees" shooting 1200 rounds per minute, it relied on shattering enemy armor through consistent and repetitive fire
Automatic rifles
StG 44 – The first widely issued assault rifle in the world
AK-47 – a famous Soviet automatic rifle whose derivatives have been used in almost every conflict since its invention in 1947
AKM- an upgraded version AK-47. The stamped receiver drastically cut down production times, which allowed just about any country to manufacture it. The most common variant of this weapon; most rifles that are referred to as AK-47s are in fact AKMs.
AKMS – a Paratroop model of the AKM with a folding stock
AK-74 – a newer model of the AK series; it fired a newer and smaller round, the 5.45mm
AKS-74 – a model of AK-74 designed for paratroopers