Mr. Keenan makes a great point.
And if they ain't changing springs, they are cleaning or bolting stuff on and off. Saves ammo tho'.
I'm not a gunsmith and I ain't smart, still learning. Now I have used Wolff springs, great quality...
Old Gunny when I was 6 told me something, heard it repeated by my uncle and other folks that I consider mentors.
The user knows the firearm from USE, and a relationship develops. The firearm will advise what, where and intervals of attention and maintenance.
All you got to do is pay attention and listen. Inspect, maintain and don't obsess.
Growing up poor has its rewards, I did not know about Wolff...When a mag needed attention we replaced with the USGI springs or the ones from Colt.
I ran over one once, fell off the tailgate. Kept the innards , mag body split. Just kept parts, kept eyes open for parts...made do.
I didnt't start marking mags till a few yrs ago. If it needed attention it was put aside and fixed.
Problem came up with more modern guns. Some guns only wanted to run with certain guns. Sure was easier when everything was spec'd and 7 rds.
bigjim- I betcha not all need replacing, I'd mark 'em and run 'em. You don't say what make ( s) you have. Yep tho' Wolff is the way to go most times- don't rule out the factory springs and followers on those factory Colts either...they lasted this long didn't they?
Keep us advised what and how this plays out.