Just got in three conversion kits from Kriss to change Glock 20 mags to 32 round mags. With minor modifications, their 45 auto extension kit works on a Glock 20. You can see a video on you tube, search Kriss Glock 20 conversion. These should be fine with all the persosed guns regs they are throwing around. Lol Remember the good ole days of freedom? Image shows Glock 20, 3 mags, 2 with Arredondo 5 round extensions, 1 with the Kriss mag extension, 1 round butt plug, holster with extra mag holder. Pistol, with one in the chamber, one in the butt, extra mag, and the Kriss mag, has a total rounds in a small package, of 54 rounds. Leave a couple rounds out of each mag to be kind to the springs, and you can hold a full box of fifty 10MM rounds in your sidearm. To big for CCW? Sure, but bot too big for briefcase, or nightstand.