[41mag10mm]

Camoden, rimless cartridges headspace at the mouth. The 9mm luger is 9x19 and the barrel will only safely fire that round. You can fit a shorter cartridge of the same diameter in the chamber, but it will most likely not fire the round consistantly. The firing pin will tend to drive the cartrdge forward further into the chamber leaving a light strike on the primer, but not igniting it. If you put a longer cartridge in, such as the 9x23, the slide will not go fully into battery.