Just want to add that both chambers are stepped in a luger, although the step in the 7,65 version is bigger, of course. The 9mm has a small step in the chamber that will provide excellent seating and a good gas seal (and a nice indentation around the cartridge's top edge).
The guys are right that the chamber and barrel are one package and that removing a barrel without proper tools will most likely ruin the barrel and the receiver.
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