Here is a series of platforms to store your pistol magazines. I created them to work with 22lr-45cal cartridges. I marked the caliber on the front for easier recognition and they are 6" x 2" on the perimeter.
The 9mm will work for 380 mags
The 10mm will also work for 40cal and 357 Sig.
I added a rack for the Buckmark and Ruger mark series pistols since their angle is so much greater than a standard mag.