Without a doubt engraving pens would be the most durable, and permanent. Most guys don't want permanent, in case they want to eventually sell the mags, or change the numbering system.
Paint pens work well. You will have some of the marking go away, via chipping or wearing down, but with all I have seen I could still make out the number written. Paint also isn't permanent.
"Every step we take towards making the State our Caretaker of our lives, by that much we move toward making the State our Master." Dwight D. Eisenhower
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