I was shooting my 1979 dated P1 with my 124 grain reloads when I noticed that the recoil pulse felt a bit different - as if the slide had locked back on an empty magazine but I knew that rounds remained in the magazine. The slide was partially back, but I wasn't able to move it forward or back easily. I ended up tapping the slide forward off the frame and noticed the broken lug on the locking block - interesting. This is the same pistol that has spontaneously ejected the extractor from the frame on at least 2 occasions. I also own a 1941 dated Walther P38 that has fired the same number of rounds of the same ammo as the P1 with absolutely no issues at all. So I'm not terribly impressed by the P1 thus far, and would definitely go with the P38 if my life depended on it and I was forced to choose between the two. My P1 is one of the later models with the reinforcing pin in the frame. I've ordered a replacement locking block so we'll see how that goes.