Luger parts are matched to the firearm when it is manufactured or rebuilt by an arsenal.
The precision fit of parts in a Luger is somewhat tighter than other firearms of different designs.
In the field, if you disassembled and cleaned your gun, you wanted to get all the parts back into it. Imagine several soldiers working together, and you can see the potential for an accidental swap.
Therefore, they made it relatively easy to match things back up.
When parts from different guns are swapped, they often have to be force matched. Sometimes you'll see an electropencil scratch marked number. This probably was done when a part was force matched to fit, perhaps by an arsenal, gunsmith or owner.
Marc
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