One way to check is to try a replacement pin in the forward toggle and breech block holes to see if there is any play. If there is play, then wear is contributing to the problem. I had multiple standard size pins snap in a luger that eventually required an oversized pin.
If it seems to fit properly, try shooting it. If there are still problems, the pin will snap apart again.
When Mauser re-engineered things in the 1970's, they reshaped the ends of the pins (concave rather than flat ends). I believe that this was to improve distribution of the forces acting on the pins during the firing cycle.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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