I would not recommend it. By applying paint to a magazine no matter how light the coat, you will to some degree increase the overall circumference of it. This will increase your likelihood of the magazine become hung up if not plain "jammed" in the gun while attempting to reload. While in Iraq and Afghanistan I went so far as to "polish" the matte finish off of my magazines (for that dang M-9) in order to decrease any possible drag when exposed to sand & dirt. I think most paints might very well heat up (at the range during sustained firing) and quite possibly create quite a mess as well. Just some thoughts.