A couple of years ago I came across these magazines and they quickly became my favorite. First off they are cheap which is always a bonus. Next up they are durable. The ones I have are all gen 2 which are more durable. I guess the gen 1 mags use to bulge it break if you left then loaded too long.
I have a hand full. Some have had hundreds even thousands of round through them. I've also left them loaded for extended periods... I have to admit I also really like the hexagons all over it. It adds a good grip. The grey is tape you can add extra for even more grip.