Walther MPL: full disassembly & assembly

The Walther MP (Maschinenpistole) series is a family of 9×19mm 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, and that the MPL has 100 and 200 meter settings.