A Simple MPX magazine holder. A great way to organize the magazines in your safe. Easily able to remove the mags, and place them back into the holder. Mags can be stored loaded, or unloaded. Works with 10, 20, or 30 Round mags. Gen 1 or 2. Not sure about the newer mags, as I don't own any of those. But if you print it out and they do fit, I'd love to know! 20% infill, no supports needed.