The flat firing pins were subject to stress concentrations due to the sharp corners of the flat pins and the way the safety holds the pin and the hammer drops on it! I have replaced some of these, easy work! You need to make sure the disconnector pin moves freely also. In good shape these guns are super to fire. If you have a collecton grade piece I would recommend not redoing it as it would reduce the value. I am going to be redoing one for me in a couple of months when the dust cloud settles on my Luger business along with a PPK. Walther and Mauser and Spreewerke all made P.38s at their respective plants, and some parts were made in CZECH. (barrels for sure) The factory codes were "ac" for Walther, "byf" for Mauser and "cyq" (sometimes "cvq") for the Spreewerke weapons. If it is in good condition and all original, I might have a gun smith check out the firing pin, diconnector and other moving parts for wear and/or cracks and shoot it sparingly. If mismatched or in poor condition you might hae it reworked, reblued, or just cleaned up as you said. They really are neat guns. Have fun! Thor
Ted's Luger Strawing Service