Submachine gun

submachine gunssub-machine gunsub-machine gunsSMGsubmachinegunsub machine gunburp gunSMGssubmachine-gunsubmachineguns
A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire pistol cartridges.wikipedia
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SWAT

SWAT teamSpecial Weapons and TacticsSWAT teams
However, submachine guns are still used by military special forces and police SWAT teams for close quarters battle (CQB) because they are "a pistol-caliber weapon that's easy to control, and less likely to over-penetrate the target".
SWAT units are often equipped with specialized firearms including submachine guns, assault rifles, breaching shotguns, sniper rifles, riot control agents, and stun grenades.

Machine pistol

automatic pistolmachine pistolsmachine-pistol
During World War I, the Austrians introduced the world's first machine pistol the Steyr Repetierpistole M1912/P16. The Germans also experimented with machine pistols by converting pistols such as the Mauser C96 and Luger P-08 from semiautomatic to fully automatic operation and adding detachable stocks.
During World War I, the Austrians introduced the world's first machine pistol the Steyr Repetierpistole M1912/P16. The Germans also experimented with machine pistols, by converting various types of semi-automatic pistols to full-auto, leading to the development of the first practical submachine gun.

Beretta M1918

Beretta Model 1918Beretta modello 1918MAB18
This odd design was then modified into the OVP 1918 carbine-type submachine gun, which then evolved into the 9×19mm Parabellum Beretta Model 1918 after the end of World War I. Both the OVP 1918 and the Beretta 1918 had a traditional wooden stock, a 25-round top-fed box magazine, and had a cyclic rate of fire of 900 rounds per minute.
The Beretta Model 1918 was a submachine gun that entered service in 1918 with the Italian armed forces.

MP 18

MP 28MP28Bergmann
By 1918, Bergmann Waffenfabrik had developed the 9 mm Parabellum MP 18, the first practical submachine gun. In 1941, Britain adopted the 9 mm Parabellum Lanchester submachine gun. Following the Dunkirk evacuation, and with no time for the usual research and development for a new weapon, it was decided to make a direct copy of the German MP 28.
The MP 18 manufactured by Theodor Bergmann Abteilung Waffenbau was the first submachine gun used in combat.

OVP 1918

OVPVillar-Perosa OVP M1918
This odd design was then modified into the OVP 1918 carbine-type submachine gun, which then evolved into the 9×19mm Parabellum Beretta Model 1918 after the end of World War I. Both the OVP 1918 and the Beretta 1918 had a traditional wooden stock, a 25-round top-fed box magazine, and had a cyclic rate of fire of 900 rounds per minute.
The OVP 1918 was a submachine gun developed in Italy.

9mm Glisenti

9 mm Glisenti
In 1915, the Italians introduced the Villar-Perosa aircraft machine gun. It fired pistol-caliber 9mm Glisenti ammunition, but was not a true submachine gun, as it was originally designed as a mounted weapon.
The 9mm Glisenti is an Italian pistol and submachine gun cartridge.

Carbine

carbinespistol-caliber carbinecarabine
A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire pistol cartridges.
Although the United States had developed the M2 Carbine, a selective-fire version of the M1 Carbine during WW2, the .30 Carbine cartridge was closer to a pistol round in power, making it more of a submachine gun than an assault rifle.

Beretta Model 38

Beretta 38/ABeretta MABBeretta MAB 38
The Italians were among the first to develop submachine guns during World War I. However, they were slow to produce them during World War II. The 9 mm Parabellum Beretta Model 1938 was not available in large numbers until 1943.
The MAB 38 (Moschetto Automatico Beretta Modello 1938), Modello 38, or Model 38 and its variants were a series of official submachine guns of the Royal Italian Army introduced in 1938 and used during World War II.

Villar Perosa aircraft submachine gun

Villar PerosaSturmpistole M1918Villar Perosa submachine guns
In 1915, the Italians introduced the Villar-Perosa aircraft machine gun. It fired pistol-caliber 9mm Glisenti ammunition, but was not a true submachine gun, as it was originally designed as a mounted weapon.
While it was designed to use 9mm pistol ammunition, it is said to be the first true submachine gun.

Suomi KP/-31

Kpist m/37SuomiSuomi M1931
During the Winter War, the badly outnumbered Finnish used the Suomi KP/-31 in large numbers against the Russians with devastating effect.
The Suomi KP/-31 (Suomi-konepistooli or "Finland-submachine gun", literally: "Finland Machine-pistol") was a submachine gun (SMG) of Finnish design used during World War II.

Automatic firearm

automatic weaponautomatic weaponsautomatic
A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire pistol cartridges.
Submachine gun: An automatic, short rifle (carbine) that uses pistol cartridges. Today seldom used militarily, due to body armour making them ineffective, but they are commonly used by police forces and close protection units in many parts of the world.

PPSh-41

submachine gunPPSh-41 "burp gunPPSh
In 1940, the Russians introduced the 7.62×25mm PPD-40 and later the more easily manufactured PPSh-41 in response to their experience during the Winter War against Finland.
The PPSh-41 (pistolet-pulemyot Shpagina; Пистолет-пулемёт Шпагина; "Shpagin machine pistol"); is a Soviet submachine gun designed by Georgy Shpagin as a cheap, reliable, and simplified alternative to the PPD-40.

PPD-40

PPD-34PPD Submachine Gun
In 1940, the Russians introduced the 7.62×25mm PPD-40 and later the more easily manufactured PPSh-41 in response to their experience during the Winter War against Finland.
The PPD (Pistolet-Pulemyot Degtyaryova, Russian: Пистолет-пулемёт Дегтярёва, Degtyaryov machine pistol) is a submachine gun originally designed in 1934 by Vasily Degtyaryov.

Lanchester submachine gun

LanchesterLanchester Mk ILanchester Machine Carbine
In 1941, Britain adopted the 9 mm Parabellum Lanchester submachine gun. Following the Dunkirk evacuation, and with no time for the usual research and development for a new weapon, it was decided to make a direct copy of the German MP 28.
The Lanchester is a submachine gun (SMG) manufactured by the Sterling Armaments Company between 1941 and 1945.

PPS submachine gun

PPS-43PPSPPS-42
Later in the war they developed the even more readily mass-produced PPS submachine gun. The USSR would go on to make over 6 million PPSh-41s and 2 million PPSs by the end of World War II. Thus, the Soviet Union could field huge numbers of submachine guns against the Wehrmacht, with whole infantry battalions being armed with little else.
The PPS (Russian: ППС – "Пистолет-пулемёт Судаева" or "Pistolet-pulemyot Sudayeva", in English: "Sudayev's submachine-gun") is a family of Soviet submachine guns chambered in 7.62×25mm Tokarev, developed by Alexei Sudayev as a low-cost personal defense weapon for reconnaissance units, vehicle crews and support service personnel.

Sten

Sten gunSten gunsSten Mk II
Shortly thereafter, the simpler STEN submachine gun was developed, which was much cheaper and faster to make.
The STEN (or Sten gun) was a family of British submachine guns chambered in 9×19mm and used extensively by British and Commonwealth forces throughout World War II and the Korean War.

Sterling submachine gun

SterlingCarbine 1A1L2A3 Sterling
Over 4 million STEN Guns were made during World War II. The STEN was so cheap and easy to make that Germany started manufacturing their own copy (the MP 3008) towards the end of World War II. After the war, the British replaced the STEN with the Sterling submachine gun. Britain also used many M1928 Thompson submachine guns during World War II.
The Sterling submachine gun is a British submachine gun.

Thompson submachine gun

tommy gunThompsonTommy guns
The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun.
The Thompson submachine gun is an American submachine gun, invented by John T. Thompson in 1918, that became infamous during the Prohibition era, being a signature weapon of various crime syndicates in the United States.

M3 submachine gun

M3 "Grease GunM3M3 Grease Gun
Therefore, the U.S. developed the M3 submachine gun or "Grease Gun" in 1942, followed by the improved M3A1 in 1944.
The M3 was an American .45-caliber submachine gun adopted for U.S. Army service on 12 December 1942, as the United States Submachine Gun, Cal. .45, M3. The M3 was chambered for the same .45 ACP round fired by the Thompson submachine gun, but was cheaper to produce and lighter, although, contrary to popular belief, it was less accurate.

Owen Gun

OwenMachine Carbine, 9 mm Owen, Mark 1Kokoda
The Owen Gun is a 9mm Parabellum Australian submachine gun designed by Evelyn Owen in 1939.
The Owen Gun, which was known officially as the Owen Machine Carbine, was an Australian submachine gun designed by Evelyn (Evo) Owen in 1939.

Carl Gustav m/45

Kpist m/45Carl GustavSwedish K
In 1945, Sweden introduced the 9 mm Parabellum Carl Gustav M/45 with a design borrowing from and improving on many design elements of earlier submachine-gun designs.
The Kulsprutepistol m/45 (Kpist m/45), also known as the Carl Gustav M/45 and the Swedish K SMG, is a 9×19mm Swedish submachine gun designed by Gunnar Johnsson, adopted in 1945 (hence the m/45 designation), and manufactured at the Carl Gustafs Stads Gevärsfaktori in Eskilstuna, Sweden.

Drum magazine

drumdrumssaddle-drum
The Germans initially used heavier versions of the P08 pistol equipped with a detachable stock, larger-capacity snail-drum magazine and a longer barrel.
The advantage over traditional box-shaped magazines is that a drum magazine can carry much more ammunition, often two to three times that of a box magazine, such as the 71-round drum for the Finnish Suomi KP/-31 and its latter semi-influenced Russian PPSh-41 submachine guns, without making the gun too big to carry easily.

Madsen M-50

MadsenMadsen M-46Madsen M/46
In 1946, Denmark introduced the Madsen M-46, and in 1950, an improved model the Madsen M-50. These 9 mm Parabellum stamped steel SMGs featured a unique clamshell type design, a side folding stock and a grip-safety on the magazine housing.
The Madsen M-50 or M/50 is a submachine gun introduced in 1950.

Karabiner 98k

Mauser Kar98kKar 98kK98k
It proved to be far more practical and effective in close quarters combat than the standard-issue German Kar 98K bolt-action rifle.
In close combat, however, submachine guns were often preferred, especially for urban combat, where the rifle's range and low rate of fire were not very useful, although the rifle's powerful ammunition was better able to penetrate walls and other cover found in urban areas.

MP 3008

Maschinenpistole 3008
Over 4 million STEN Guns were made during World War II. The STEN was so cheap and easy to make that Germany started manufacturing their own copy (the MP 3008) towards the end of World War II. After the war, the British replaced the STEN with the Sterling submachine gun. Britain also used many M1928 Thompson submachine guns during World War II.
The 9×19mm MP 3008 (Maschinenpistole 3008 or "machine pistol 3008", also Volks-MP.3008 and Gerät Neumünster ) was a German substitute standard submachine gun manufactured toward the end of World War II in early 1945.