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by NuJudge
That pistol is mechanically very similar to the Walther P38/P1, and also the Beretta 92/96 series. I handled a P5 at Interarms long ago, but not shot one.
I have shot the Walther P38 and Beretta 92 a heck of a lot. My P38 was my only pistol for a long time, and it got shot a lot with WWII surplus. I never did anything to it but clean & oil it. One day in the late 1980s, as I was oiling it up, I noticed a crack working its way up the side of the slide at the locking piece recess. I should have changed the recoil springs. Fortunately, a replacement slide was not expensive, but I now change the springs after several thousand rounds, and have not had further trouble.
The other problems I have seen happen to others are with the locking piece breaking a wing off, and if you pierce a primer the gasses can blow the top cover off the slide and have parts escape.
You would do well to ascertain which parts are the same as P38/P1 parts and lay in a supply. CDNN once had a huge supply of P1 parts which they have sold most off cheap.