Great idea, product needs a redesign - Cross Industries AR15 Coupling Pistol Magazine

Living in California, I figured these would be great as you can quickly change out an empty magazine with a full one (full as in only ten rounds unfortunately for us behind enemy lines). The design is great as you can connect two different ways depending on your reload preference. However, if you use these mags to leave full in order to stage for defensive use, I had three individual magazines crack along the side edge a bit over a year of ownership and had them replaced under warranty. However, I just used the replacements today in an AR class and had multiple double feeds and failure to feeds with multiple magazines (I know as I have them individually numbered). Once I switched to my HEX mags, the issue never happened again, so my conclusion is the feed lips are a bit out of spec. So, again great idea, but poor execution. If you want to train random malfunction drills, pick up a couple. Otherwise, stick with Magpul or HEX Mag 10/30 magazines.