Well, I went to the range today, first time since getting my new replacement slide back from Kel-Tec (the original slide had peened around the guide rod hole). Prior to going to shoot, I cleaned and lubed the gun and installed the famous JFB washer. I also put on one of sprinter's grip covers (highly recommended, by the way!). At the range, I put 150 rounds of Remington UMC ammo down the pipe. The gun did not malfunction in any way, even once. It shot clean and crisp and I actually got some pretty good groups at 7 yards during rounds 50 - 100 (I was getting used to the sights for the first fifty rounds and suffering some serious hand fatigue for the last fifty!). But, as this was a function test, I didn't consider accuracy important. I just wanted to see if the gun worked and whether or not the gun evidenced any signs of peening. Now, when I got home and disassembled the gun for cleaning, I noticed two things: 1) The guide rod hole seemed to be slightly deformed (elongated at the bottom edge) and showed some *very* slight signs of peening in the same area. Also, and this was a bigger surprise, the head of the guide rod, where it sits in the notch in the barrel, had peened! It was flat on the side that contacted the barrel. Personally, I've never seen or heard of the head of the guide rod peening. Has anybody else experienced this? Is it a problem? Do you think it was caused by the installation of the washer? I really don't understand what's happening -- With the washer installed, shouldn't the nominal thickness of the guide rod hole be increased, thereby eliminating the possibility of peening? If someone can explain what it is that causes the two types of peening described above, I'd appreciate it very much. If what I've described don't seem to be issues, I'd be very happy to just live with it, as the gun functions perfectly. But, I'm afraid that function *will* be affected, if the peening gets any worse. Any help would be greatly appreciated -- Thanks!