I've had it for 3 years now and have put thousands of rounds through it with no issues at all until today. During rapid fire I would pull the trigger and no bang. This happened about 5 times with 2 different mags and a chinese drum. The problem was that it was not chambering a new round. I noticed when I inserted a mag it had a lot of forward and rearward movement. To me it looks like the problem is a gap at the top of the mag release where the tab at the back of the magazine goes in. Has anyone else had this problem?