Are there any out there? I know it could be considered overkill, but I have had a factory 22 round .40S&W magazine in my bedside (now, since I got my USP45, my wife's bedside) Glock 23. Love the extra fire power and because it is Glock factory made, it has been flawless. Do they make something like this for my USP? ...just in case 13 rounds of .45ACP aren't enough, LOL! I've seen the ProMag 20 rounder, but have heard nothing but negative comments about it. I'm just trying to be prepared for the ninjas... all of them...