Old luger

[Mac Cat]

Welcome to the Luger Forum.

You should post a photos of your luger for best results.
Both sides, top, and under the barrel in particular.

You can look under the barrel if it is a military issued luger for the 8.xx barrel size.
Another trick is to try to insert a #2 pencil into the barrel.
It will fit in a 9mm hole, but not a 7.65mm.