I bought one of these a couple of months ago. With one of the original magazines the gun functioned 100%. With the other, it was more like 25%. I sent it back to Taurus and in a couple of weeks I received a new one. This one also functions 100%. I really like this little thing. In spite of its size and trigger, it shoots really well. My last trip to the range was a problem though. The slide didn't lock back on the last round, but it didn't go completely forward either. The thing is all jammed up and I couldn't get the magazine out, or the slide to move forward or back. I haven't had time to really examine it yet to see what might have broken or come loose. Has anyone had a similar problem with their Millenium Pro?