Monday I got a new PM45 Diamond black coated staniless steel slide with night sights. I got it to the range yesturday to do the break in. I decided to break it in with Winchester white box ammo. First off I was enjoying the gun, after the first mag, the slide locked back. I put in the other mag and depressed the slide lever and it failed to feed. The bullet stopped tilted and not in the chamber. I cleared it and manually racked it, no problems. I experienced the same issue of the first round not chambering after the last round lockback and realized that because of the stiffness of the magazine spring the recoil springs were having a rough time taking that first round out of the magazine. I then just manually pulled the slide the rest of the way back and let the slide close and it no longer had that problem. All was well then until around round 160 when I began experiencing a failure of the trigger to reset and a failure to feed. This became progressivly worse through round 185 when I was loading each round one at a time, the gun jamming each time. I attributed this to gunk build up in the gun. Such a small weapon must not have the same tolerances to go several hundred rounds without a cleaning the way my ruger p-90 does. I cleaned the gun this evening and had a terrible time starting to clean it because to field strip it you must pull the trigger to slide the slide off, because the trigger did not want to reset at all. I cleaned it and payed special attention to cleaning the trigger spring, the trigger bar, and the area at the back that the trigger bar pulls on. After reassembly I realized that the trigger will not reset unless it travels forward with speed, allowing the slide to slam forward. Is normal for this model or is the trigger is supposed to reset with the slide simply being pulled back and let forward gently? I noticed the trigger also will not reset if the trigger is depressed past the reset point while the slide slams closed. Is that normal as well? Before the gun is carry reliable I want to put at least 300 consecutive rounds though it with a failure of the trigger to reset. I'll put those rounds through it on 3 seperate range sessions with a cleaning between each one.