I've got a buddy that does powder coating on the side and asked him if he had anything to refinish mags with and he recomended a product called TEF-COAT its a baked on (250degs.)teflon coating that comes in several colors.He uses it to coat rifle scope tubes that need to be camo(he works for premiere rectical)Anyway i had him do a 30rounder that had busted feed lips as a test and it came out really nice and the coating is tuff!we tossed it around on the shop floor and it didnt even scrach it.We used the "gray" color and it matches the USGI finish almost perfectly(comes out a little "flater" Anyway thought i'd share. UNDERDOG