Original Glock springs
Once at the Glock factory (1985) in Austria, I was told that Glock did not manufacture their springs, but purchased from a sub contractor? Now make their own?
For years on the wall of my reloading cubby hole I kept a new G17 mag; spring that was next to one that was an inch shorter, an old one, I routinely changed springs when they lost that inch, but never remember a problem with this inch down. Did the same with firing pin springs.