Fella's;
I normally carry & have for years. I got 2 mags with it when I bought the gun & bought two more a coupla years after that. Didn't worry about spring set or anything else, including mag rotation, & continued on that way for years.
About 2 years ago, I sent the gun into the factory & had an ambi safty installed. At the same time, as insurance, I ordered 4 mag springs. When I got the gun back, I checked the overall length of the old springs against the new. The old one's though they were functioning just fine, were about 1/2" shorter.
So, I changed them out & now rotate every week. Never did have a problem, but just trying to slam the door in Murphy's face.
900F