These replacement magazines for your Glock from Magpul don't do anything special. In fact, they're boring. And that is what makes them so special. You load them them up, insert them in your pistol, and they work. Just like Factory mags. They. Just. work. But for less money.
Sure, you get Magpul's Dot Matrix Marking space like on their Pmags and these are easy to disassemble. But they are cool because they are boring. Boring reliability for less money. That lets you trust the gear you keep on hand but keep more gear.