I finally disassembled the Mauser bolt (Yes, this is BR, but one from the 1950's). The firing pin is polished brightly over 100-120 degrees it's last 2mm, still with tooling marks the rest of its circumference. I KNOW what I've seen on the target, but what would one expect from such a condition? There being no Mauser firing pins for sale, it seems, what can I do?