I have (had) a magazine for my Glock that would jam when loading at about the sixth or seventh round. It would just stick tight and not move any farther. I looked up on line how to disassemble the magazine to see if I could fix it, and well, I did. In trying to take it apart I broke the base plate. There was definitely something wrong with the magazine as I was able to take apart 2 other Glock mags without a problem. Not sure what was the matter with it but I think I will just replace it.