In what way, how old was it, what caliber?
One of the original Glock mags, came with the gun about ten years ago. Model 22, .40 S&W. One fine day I went to pop it out and ended up damn near prying it out. Not good. The other mags are fine, and it certainly wasn’t that tight going in or I’d have noticed. I have two Glocks, a 22 and a 19, and nothing like that ever happened to either of them before.