It's always interesting to me to see how different manufacturers handle things. When I bought my Beretta 92A1 a few months ago I cleaned the pistol itself and lubed it up, but didn't think to touch the magazines.
I was having lots of problems with it during the first session.
Took a look at the magazines and ... coated with heavier than usual oil which was rather thick.
Cleaned the mags thoroughly and applied light lube (Ballistol).
Not a single problem since.