The MP 38 and MP 40 (MP designates Maschinenpistole, literally "Machine Pistol") were submachine guns developed in Nazi Germany and used extensively by paratroopers, tank crews, platoon and squad leaders, and other troops during World War II.
The MP 40 was 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 German Armament services 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, notably in the more extensive use of stamped steel rather than machined parts.
Other changes resulted from experiences with the several thousand MP 38s in service since 1939, which had been used in action during the invasion of Poland. The changes were incorporated into an intermediate version, the MP 38/40, and then used in the initial MP 40 production version. Just over 1 million were made of all versions in the course of the war.
The MP 40 was often called the "Schmeisser" by the Allies, after weapons designer Hugo Schmeisser. Schmeisser had designed the MP 18, which was the first mass-produced submachine gun, and saw extensive service at the end of the First World War. He did not, however, design the MP 40, although he held a patent on the magazine. He later designed the MP 41, which was an MP 40 with a wooden rifle stock and a selector, identical to those found on the earlier MP 28 submachine gun. The MP 41 was not introduced as a service weapon with the German Army, but saw limited use with some SS and police units. They were also exported to Germany's ally, Romania. The MP 41's production run was brief, as Erma filed a successful patent infringement lawsuit against Schmeisser's employer, Haenel.
Despite the impression given by popular culture, particularly in war films and video games, MP 40s were generally issued only to paratroopers and platoon and squad leaders; the majority of German soldiers carried Karabiner 98k rifles. However, later experience with Soviet tactics - such as the Battle of Stalingrad where entire units armed with submachine guns outgunned their German counterparts in short range urban combat - caused a shift in tactics, and by the end of the war the MP 40 and its derivatives were being issued to entire assault platoons on a limited basis.
There were never enough MP 40s to go around, because raw material and labor costs made it expensive to produce alongside the Kar98 rifles. Starting in 1943, the German army moved to replace both the Kar-98 rifle and MP 40 with the new MP 43/44 assault rifle, also known later as the StG 44.
Both MP 38 and MP 40 submachine guns are open-bolt, blowback-operated automatic arms. Fully automatic fire was the only setting, but the relatively low rate of fire allowed for 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 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, used to hold the bolt in forward position.
The MP 38 receiver was made of machined steel, but this was a time-consuming and expensive process. To save time and materiels, 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 M38/40 and MP 40.
One unique feature found on 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 Sdkfz 251 half-track. A handguard, made of a synthetic materiel 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 38 and 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 Thompson's double-column, dual-feed magazine, the MP 38 and MP 40 used a double-column, single-feed design. The single-feed 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.