Sherer (sp?) makes a pretty crappy product for the .40 and 9mm mags. On my Glock 23 13rd mags, these things suck, and are prone to the speed unload that is so terrible. The mags are non-full metal lined (non-drop free), and I'm not sure if that has anything to do with it. Anybody know of any way to improve upon this poorly made product? I was thinking of reshaping it.