One is a cartridge and the other a semi-automatic handgun commonly, but not exclusively, chambered in
9mm Parabellum. The 9x19mm cartridge has a few different names: 9x19,
9mm Parabellum, 9mmP and
9mm Luger; they are all the
same round. The
Luger pistol and the 9x19 cartridge were both designed by Georg
Luger.
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