Tom,
There is indeed a significant difference between the apparent length of your firing pin and the one in my C-96. My spring is flattended in a similar manner in order to screw into the firing pin. I suggest that the firing pin is too long - either custom made or aftermarket or who knows. I could be wrong: the only C-96 I have detailed knowledge about is the one I own, an imperial marked 9mm "Red 9."
I suggest the bent firing pin that bent a second time supports the theory that it is too long - hence the deep primer marks. Also perhaps significant that it bent and did not break? (this should be a hardened part). You might try a new firing pin from Lugerdoc. I would measure my firing pin but cannot easily remove the spring - it is kind of forged to the pin. Perhaps a real expert will chime in or you could ask Lugerdoc for firing pin OAL. Good luck, this sounds like a fun shooter. KFS
Post Script Edit: I notice that the nose of the firing pin is flattened - further evidence that it is 1). too long, and 2.) not hardended. KFS
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