Originally Posted by Ken43
Glock recommends changing out your springs every so often. Maybe that is for their benifit, however, I have worked on Glock mag's. for about 15 years and I can tell you for a fact that magazines that have been used have a shorter spring than new magazines. So to some extent they do take a set. I don't know if that has caused any malfunctions but for that reason I keep my extra magazines unloaded when in the gunsafe. The mag. in the gun I am currently using has a fully loaded mag. in it.
I have worked on a few Glocks in my time. Some of them failed to lock the slide open after the last shot. Some of them had nose down failure to feed problems leaving a few rounds jammed in the magazine below the feed lips. A new magazine or magazine spring cured the problem in every case.