I too carry the Glock 23, however I load it with Glock 22 mags. I fill the "gap" where the Model 22 mag extends beyond the grip with a plastic "collar" made for that purpose. This gives you a 16 round .40 caliber in a 9mm compact size pistol. I'd carry something better and have tried, and tried, and tried, with numerous pistols. I've not found it yet.