Sometimes.Do you store your magazines with ammo in them?
How do you make sure they last a long time?
What do you have to do besides oil them a little bit?
Do you keep your back up magazines full?
Sometimes.
Don't abuse them.
I don't even do that.
"Back up" as in the extra mags I carry on my person or in my gear? Absolutely. "Back up" as in spare or extra magazines in my inventory that are outside of the regular shooting rotation? No.
...A fully loaded mag with the spring compressed beyond its design limits and a follower that is smashed flat at the bottom of the mag is going to have problems when pressed into service again...
...This is not a theory I heard or an internet myth, it is basic metallurgical fact. Downloading your stored mags will prevent overcompressing the spring and having it lose its temper...
Springs wear out from repeated compression/decompression cycles. (Metal fatigue)Couple of cans of fully loaded magazines. Used to rotate them and was told this was a bad idea years ago, no longer do that.
I used to think, and at times still wonder, that the springs after a time would lose some strength but apparently this is not the case with quality mags.