I switched to MBX for this exact reason. If you are using STI, or other mags, I bet you own a Dawson mag tuning kit, or some other tools for tuning you mags, it's not if you will need this, it's when. I have MBX for 40 and 38SC, think I made the switch 4 years ago, to date, haven't put a tool on either. If the mag is hitting the ejector during reloads, that is a disaster waiting to happen. The issue I had with MBX and the Pro 40 was, they sent me the wrong mags? Once I called them, they promptly sent me the correct mags, and I haven't had a problem since. I know it's frustrating, and there are plenty of shoots around the corner, but they will take care of you.