The Walther MP (Maschinenpistole) series is a family of 9x19mm Parabellum submachine guns produced in West Germany from 1963 to 1985 by Walther.
There are two versions of the Walther MP: the MPK (Maschinenpistole Kurz or "short machine pistol") and the MPL (Maschinenpistole Lang or "long machine pistol"). The only difference between MPK and MPL guns is the length of the barrel. They are blowback designs firing from "L"-shaped bolts. The bolts are above the barrel, permitting a shorter receiver. The receiver, made from stamped steel, forms a ventilated cooling jacket and the prominent cocking handle is located on its left front. A selective fire switch is also on the left side of the receiver, behind the trigger. Both guns feature side-folding buttstocks, made from thin steel tubes, and both guns feature flip-up sights. The MPL has 100 and 200 meter settings.