|Place of origin||Nazi Germany|
|In service||1940–1945 (Nazi Germany)|
1940–present (other countries)
|Used by||See Operators|
|Unit cost||57 RM (1940)|
230 EUR current equivalent
|No. built||1,100,000 (estimated)|
|Mass||3.97 kg (8.75 lb)|
|Length||833 mm (32.8 in) stock extended/630 mm (24.8 in) stock folded|
|Barrel length||251 mm (9.9 in)|
|Action||Straight blowback, open bolt|
|Rate of fire||500–550 rounds/min|
|Muzzle velocity||400 m/s (1,312 ft/s)|
|Effective firing range||100–200 m|
|Maximum firing range||250 m|
|Feed system||32-round detachable box magazine, 64-round with dual magazines|
|Sights||Hooded front blade|
Designed in 1938 by Heinrich Vollmer with inspiration from its predecessor the MP 38, it was heavily used by infantrymen (particularly platoon and squad leaders), and by paratroopers, on the Eastern and Western Fronts as well as armoured fighting vehicle crews. Its advanced and modern features made it a favorite among soldiers and popular in countries from various parts of the world after the war. It was often called "Schmeisser" by the Allies, after Hugo Schmeisser, who designed the MP 18, although he was not involved in the design or production of the MP40. The weapon's other variants included the MP 40/I and the MP 41. From 1940 to 1945, an estimated 1.1 million were produced by Erma Werke.
The Maschinenpistole 40 ("Machine pistol 40") descended from its predecessor the MP 38, which was in turn based on the MP 36, a prototype made of machined steel. The MP 36 was developed independently by Erma Werke's Berthold Geipel with funding from the German Army. It took design elements from Heinrich Vollmer's VPM 1930 and EMP. Vollmer then worked on Berthold Geipel's MP 36 and in 1938 submitted a prototype to answer a request from the Heereswaffenamt (Army Weapons Office) for a new submachine gun, which was adopted as MP 38. The MP 38 was a simplification of the MP 36, and the MP 40 was a further simplification of the MP 38, with certain cost-saving alterations, most notably in the more extensive use of stamped steel rather than machined parts.
The MP 40 was often called the "Schmeisser" by the Allies, after the weapon designer Hugo Schmeisser. Schmeisser had designed the MP 18, which was the first mass-produced submachine gun. He did not, however, have anything to do with the design or development of the MP 40, although he held a patent on the magazine.
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 bolt features a telescoping return spring guide which serves as a pneumatic recoil buffer. The cocking handle was permanently attached to the bolt on early MP 38s, but on late production MP 38s and MP 40s, the bolt handle was made as a separate part. It also served as a safety by pushing the head of the handle into one of two separate notches above the main opening; this action locked the bolt either in the cocked (rear) or uncocked (forward) position. The absence of this feature on early MP 38s resulted in field expedients such as leather harnesses with a small loop that were used to hold the bolt in the forward position.
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.
One unique feature found on most MP 38 and MP 40 submachine guns was an aluminum, steel, or bakelite resting bar or support under the barrel. This was used to steady the weapon when firing over the side of open-top armored personnel carriers such as the Sd.Kfz. 251 half-track. A handguard, made of a synthetic material derived from bakelite, was located between the magazine housing and the pistol grip. The barrel lacked any form of insulation, which often resulted in burns on the supporting hand if it was incorrectly positioned. The MP 40 also had a forward-folding metal stock, the first for a submachine gun, resulting in a shorter overall weapon when folded. However, this stock design was at times insufficiently durable for hard combat use.
Although the MP 40 was generally reliable, a major weakness was its 32-round magazine. Unlike the double-column, staggered-feed magazine insert found on the Thompson M1921/1928 variants, the MP 40 used a double-column, single-feed insert. The single-feed insert resulted in increased friction against the remaining cartridges moving upwards towards the feed lips, occasionally resulting in feed failures; this problem was exacerbated by the presence of dirt or other debris. Another problem was that the magazine was also sometimes misused as a handhold. This could cause the weapon to malfunction when hand pressure on the magazine body caused the magazine lips to move out of the line of feed, since the magazine well did not keep the magazine firmly locked. German soldiers were trained to grasp either the handhold on the underside of the weapon or the magazine housing with the supporting hand to avoid feed malfunctions.
However, later confrontations with Soviet troops such as the Battle of Stalingrad, where entire enemy units were armed with PPSh-41 submachine guns, the Germans found themselves out-gunned in short range urban combat which caused a shift in their tactics, and by the end of the war the MP 40 and its derivatives were sometimes issued to entire assault platoons. Starting in 1943, the German military moved to replace both the Karabiner 98k rifle and MP 40 with the new, revolutionary StG 44. By the end of World War II in 1945, an estimated 1.1 million MP 40s had been produced of all variants.
During and after the end of World War II, many MP 40s were captured or surrendered (upwards of 200,000) to the Allies and were then redistributed to the paramilitary and irregular forces of some developing countries. The Norwegian army withdrew the MP 38 from use in 1975 but used the MP 40 for some years more. In particular, the Territorials (Heimevernet) used it until about 1990, when it was replaced by the Heckler & Koch MP5.
The MP 40/I (sometimes erroneously called MP 40/II) was a modified version of the standard MP 40 with a dual side-by-side magazine holder (for a theoretical ammunition total of 64 rounds), designed for special operations troops on the Eastern Front to compensate for the enemies' PPSh-41 larger magazine capacity. However, the design proved unsuccessful due to weight and reliability issues. Authentic versions, in addition to the dual mag magazine well, also have a smaller buttpad and shortened ejector.
In 1941, Hugo Schmeisser designed the MP 41, which was, in reality, an MP 40 upper receiver with a lower receiver of an MP 28 submachine gun. It saw limited service, however, and was issued only to SS and police units in 1944. The MP 41 was also supplied to Germany's Axis ally Romania.
The MP 38 or MP 40 also served as a design template for various other submachine guns and self-loaders. Including:
- the Spanish Star Z45 (from 1945)
- the Yugoslavian Zastava M56 (from 1956)
- the German Selbstladebüchse BD 38 (from 2005)
Details of the MP 40 have also been adopted for other submachine guns, which otherwise differ significantly from a technical point of view:
- For the construction of the US-American M3 "Grease Gun" (from 1942) captured MP 40 and surrendered Sten-submachine guns were examined for further usable construction details. The Allies chose their submachine gun armament based on the use of captured German ammunition, which is why the French Résistance, for example, preferred to use the British Sten Gun and American submachine guns,which were specially manufactured in 9×19mm caliber for delivery to European resistance groups (e.g. UD-42).
- The retractable shoulder rest became the model for many subsequent submachine guns. During the Second World War, the Soviet PPS-43 (from 1943) was developed, the folding shoulder rest of which is based on the shoulder rest of the MP 40. The AK-47 in version S also uses this construction element.
- Due to its almost identical design, the MP 40 magazine can also be used for the Belgian Vigneron submachine gun developed in 1952.
During World War II, the resistance and the Allies sometimes captured MP 40s to replace or supplement their own weapons. The MP 40 was used for several decades following World War II by many countries around the world in armed conflicts. Some found their way into guerrilla groups such as the Viet Cong or African guerrillas.
Its operators have included:
- Algeria: the National Liberation Army used MP 40s supplied by Czechoslovakia and Yugoslavia.
- France: French resistance used captured guns during World War II. MP 40s were also carried by French Army in the French Indochina and French Algeria.
- Guatemala: MP 38/40 supplied in 1954 from Czechoslovakia, still in service with the police at the end of the Guatemalan Civil War.
- Italian Partisans: Used examples captured from German soldiers.
- Kosovo Liberation Army
- Nazi Germany used by the Wehrmacht, military police, Gestapo, Waffen-SS, Volkssturm, and Hitler Youth at the end of war.
- Polandcaptured MP 40s, were used by Polish rebels during the war.
- Soviet Union: captured MP 40s were used by Soviet partisans and Worker-Peasant Red Army. After the war, the MP 40 with other weapons, were sold to others countries in the Eastern Bloc.
- Spain: copied as the Star Model Z-45.
- South Vietnam: used by the South Vietnamese Popular Force.
- Syria: used against Israel.
- United States: captured MP 40s used by United States during World War II and by Special Forces and their Civilian Irregular Defense Group program at the beginning of the Vietnam War. Some also apparently captured in the Iraq War.
- Vietnam: captured from the French Far East Expeditionary Corps and used by the Viet Minh, the Viet Cong and the People's Army of Vietnam.
- Zimbabwe: used by ZIPRA and ZANLA.
Civilian ownership in the United States
Following the Allied occupation of Europe in 1945, U.S. servicemen shipped home thousands of captured firearms as war trophies, including MP 40s. This practice required proper registration of automatic weapons in accordance with the National Firearms Act before they could be imported, but this was curtailed later in the occupation, meaning a relatively small number of civilian-transferable MP 40s remain in circulation and are valued at around $20,000-37,500 as of 2021, with some selling for almost $50,000.
There are several semi-automatic variants and cosmetic replicas of the MP 40 available for civilian ownership in the U.S. Beginning in 2014, American Tactical Imports began importing an MP 40 replica manufactured by German Sporting Guns GmbH chambered in .22LR, and since 2016 has also imported a pistol variant chambered in 9mm. The .22LR variant features an all-metal construction with period-accurate Bakelite furniture, a folding stock, and a faux-suppressor to meet barrel length import requirements. The 9mm variant is classified as a pistol and therefore does not ship with a folding stock. Both variants are closed-bolt, blowback-operated semi-automatic firearms that vary substantially from originally manufactured MP 40s in internal operations, making them more of affordable cosmetic replicas than faithful reproductions. Neither of the GSG-manufactured variants are compatible with originally manufactured MP 40 parts and magazines.
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