I am not an engineer and can only speak from practical experience. When some of the people I train left their Glock magazines loaded for an extended period of time without "resting" the springs, the magazines failed to lock the slide open after the last shot. Most of them fed adequately, but did not lock the slide open. Some of the magazines caused feeding problems. After I replaced the magazine springs, they functioned properly in almost every case. The people who took care of their equipment and "rested" their magazine springs did not have any problems.
No math formula, no scientific studies, just my experience with maintaining over 70 Glock 22 pistols for ten years.
Guerre 'A Mort
Last edited by PBR Sailor; 03-08-2010 at 16:44..