I've bought 4 boxes of the Star Green Label PMags and about 6 boxes of the MAG mags. IMO, while certainly not terrible mags, the Star mags are inferior in every way. Inside and out they are built much more cheaply than the MAG mags. The MAG mags have stronger plastic and stiffer springs. Unless you HAVE to have PMag style mags, go with the MAG brand mags. Out of 48 mags, I've had one break on me and that was from effectively being bounced across a 30 foot concrete sidewalk. I've even left them loaded for extended periods of time, they still work perfectly. Out of 32 Star mags, I have 6 that don't feed at all and couple that only feed sometimes.