Métral submachine gun

The Metral submachine gun is a submachine gun designed by Swiss army reserves officer Gerard Metral intended for clandestine manufacture and distribution during foreign occupation circumstances.

It is blowback, select fire, "UZI" type design configuration, and open bolt submachine gun, along with the side folding stock. The design and function of the parts is based on various existing submachine guns (like SUOMI M1931 for the trigger mechanism and Ingram M10 for bolt security etc.), along with some of the authors innovations and solutions, for example the bolt construction and folding stock.

Although the subtitle of the book detailing its design and constructions calls it "homemade", its designer calls for any constructor to be skilled at metalwork, with access to a shop lathe, drill press and milling machine (the last being optional but very helpful). Metral himself says of the main spring, barrel and magazine construction: "Try doing it yourself only if you have no other choice" and calls them "difficult to build".