There are stories of 1911's from WW2 found 50 years later loaded +1 that functioned perfectly when fired. With nickel plated brass corrosion really isn't an issue. I keep my handguns loaded and all I use for defensive rounds is HST, should be a non issue.
Btw, USE is what wears magazine springs not keeping them loaded.
M&P 40 CORE, M&P FS 40, M&P 40c, M&P 40 Shield
DDM4V1 LW, DDM4V5 LW, SCAR 17s, VEPR 12