What cartridge, also known as 9 mm Luger by the C.I.P. or 9 mm NATO by NATO, is used in the submachine gun the MP 40?
MP 40 The MP 40 ("Maschinenpistole 40") was a submachine gun chambered for the 9×19mm Parabellum cartridge. It was developed in Nazi Germany and used extensively by the Axis powers during the Second World War.
Ruger American Pistol The Ruger American Pistol is a polymer-framed, semi-automatic pistol introduced by Ruger in December 2015. The pistol uses a pre-tensioned striker firing system, and is chambered in 9mm Luger and .45 ACP. The pistol uses a Browning-type locked-breech short recoil action, with a barrel cam system that is designed to reduce felt recoil. The serialized part of the pistol is a steel chassis, which is fit to a glass-filled nylon frame. The frame incorporates a Picatinny rail for mounting accessories.