Originally Posted by M&P15T
M9 mags would not be any different than any other mags. It's just that mags in the Military are far more heavily used, so they wear out much faster.
Cleaning mags (loading and unloading them repeatedly) is only increasing the wear on the springs. You're doing more harm than good.
Cleaning M-9 mags regularly, is the only way to ensure that you'll have a fire able sidearm when you need it.
I've had that issue with Mec-Gar, Beretta and Checkmate, and although the Checkmate's were the worst, and the new "sand modified" Beretta's the best, it has something to do with the design of the M-9 magazine, because every one of the magazines I own, and have carried on deployment have exhibited that behavior at one time or another.