Probably an old subject. I have 3 Glocks that I have never fired--2 22's (40 cal.) and one 21 (45acp ). I just read an article stating that Glocks have a loose chamber and part of the chamber is unsupported which allows the brass case to expand or bulge when fired. Re-sizing and re-firing will of course weaken the case where the bulge has formed. It is this reason that Glock does not recommend using reloaded ammo in their guns. Have any of you had this problem or can you add additional info? Thanks !!!