"Perhaps round comes to mind" - this statement makes no sense.
It is not a problem to make a round notch, very simple with a mill.
If the notch is important, what is it for?
It has nothing to do with firing pin protrusion.
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03man(Don Voigt); Luger student and collector.
Looking for DWM side plate: 69 ; Dreyse 1907 pistol K.S. Gendarmerie
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