Do you number your magazines? Brian Galante does and it’s a pretty good idea. It helps you identify when you have a potential problem. The cause for the majority of misfeeds — Brian has a GLOCK 19, so that’s never a problem for him — can be traced to the magazine. If all of your mags look alike, it can be hard to tell if one’s at fault. But if you number them, you can trace a problem down to a particular mag.