i notice that on all the training video's that they always drop the magazines in the dirt, time after time after time. while i certainly understand the drill, it does make me wonder if they pick these up and reuse them full of dirt, or if they have a full time person on staff doing nothing except cleaning thousands of magazines a day. i clean my mags after every shooting session. just with burnt powder residue i can feel the grit loading rounds. if i do happen to drop one in the dirt, i set it aside and do not use it the rest of the day. i suppose a gun will run with dirty mags, but would you really want all that dirt grinding away at your firearm? i would not!