I have modified several breech blocks by adding the "Finn" hole; these were on mismatched shooter lugers. I'm not sure I'd modify a matching pistol; but then if you are going to shoot it why not? It is yours.
As to whether or not it is necessary- that is another can of worms. With modern ammo, correct headspace, and correct striker nose shape, condition, and protrusion- punctured primers are not frequent.
That said, I have fired .30 luger Fiocchi ammo with apparently very thin primer metal that punctured frequently.
The block is not hard, but I did use a carbide drill as that was what I had handy.
the size of the hole is about 3/32 to 1/8", it is not critical, but should be located just at the front of the striker bore, it is a vent. The hole is perpendicular to the bore.
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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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