Firing Pin Gauge

[DonVoigt]

Originally Posted by Doubs

Never having held one, the picture is all I have to go by.

As I said, it was just a thought but I'm certain of one thing; the rounded notch has a purpose. We just don't know what that is.

The notch may just be for holding in position in a jig or other fixture.
Also notice that the notch is significantly different in size in each of the two tools shown.
Either one is not of a size that "fits" any part of a luger.