Sounds like either your firing pin spring is weak, or the ammo you used has hard primers. If it doesn't do this with any other ammo you have your answer. I doubt you damaged the firing pin/spring since these are non-removeable during standard cleaning on a Walther PPK/PPK/s. I have a Walther clone made by FEG and imported by KBI back in the mid-90's. It is an exact copy of the Walther and I cannot access the firing pin/spring without a complete disassembly - soemthing I wouldn't attempt...firing pins are generally either broken or bent - in either case they will not work at all. Yours works sporadically which indicates either ammo or weak spring. Unless youleave it cocked all the time I doubt it's the spring. As far as identification, it should be stamped on the right or left side of the slide. Can you post a pic?
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Last edited by RL357Mag; 03-29-2009 at 02:07 PM.