"sending a Luger out of my country and getting it back modified, is a nightmare) but you have to modify the chamber also. I am saying this because as far as I know the 9mm round rest on the edge of the front cartridge, and the 7.65mm rest on the neck of the cartridge in the chamber."
Since the chamber is an integral part of the barrel no further modification is necessary. In other words, each barrel is already chambered for the particular cartridge in question when it is manufactored. The receiver merely accepts the chambered barrel and at that point the conversion from one caliber to the other is complete. Then for correct function you move on to the matter of switching out the main spring and final tuning of the pistol if required.
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