mad212 said:
I wipe the outside with a lightly oiled rag, mine both came oiled so I figured i'd try to prevent rust.
They ship with a protective lubricant on them that you DO NOT want on there when using. That stuff WILL attract dirt and cause failures.
For reliability, you want to completley degrease new M&P magazines.
With the oil/grease/whatever on there, you get them dirty, they will jam up a lot. With them bone dry, they will function just fine with a surprising ammount of dirt in them.
However, the mags are not corrosion resistant, so you ahve to find a happy compromise. For me that means whenever the rust spots get to the point I can feel them when doing a reload (which is a lot less rust than you may think), I break out the CLP and some 000 steel wool. I try to give them at least 24 hours for the oil/carrier to evaporate before use as they are a bit slick, and although not as bad as the factory coating, will still attract too much dirt.