Alright. I've heard that some tanfoglios may differ in the length of the grip, not by much of course, but enough to be forced to use a fine grit sandpaper on the top of the base pads to seat the mags correctly. While others works perfectly fine. CZ shadow magazines are just a bit shorter than the ones from tanfoglio, an easy fix could be to use CZ magazines. CZ shadow and sphinx for example works fine with my tanfoglio magazines. My tanfoglio locks up fine with CZ magazines while using the shorter mag release, but not the longer one. Pull out the magazine release and inspect how it locks up the magazine, you should not be able to slam it in any futher, otherwise your mag release may have a problem.