Just a variation on an existing method really, Tim. I had noticed that while painting with MM metallics (the buffing variety), that while buffing, the fine powder collects in the rag, so I decided to buff the gray magazine with a rag that I used to buff a test sheet of plastic that I painted for the purpose, and sure enough, enough of the powder transferred to the magazine to give a worn metallic look to it. In conjunction with washes and some scratches added with steel colored pencil, they should look really cool, I hope.