I picked up a couple of "firing pin" springs. One is about 3/8" longer than the firing pin, so I assume it IS a firing pin spring. The other is about 3/4" longer than that , so what could it be? Piston rod spring (proper name?)? One other question. My searching indicates an original firing pin spring may not be strong enough to fire surplus ammo. I have a bit of Russian remanufactured German ammo (2017, non corrosive primers). Has anyone used this ammo? Is it worth trying an original firing pin spring with this ammo?