Painting them can be as simple as just disassembling it, and hitting it with krylon.
Though, being a model painter myself, your best option is to drybrush... However, there is an alternative you can do. Which is making the first layer of paint a 'metallic', then paint over it with a matte black paint afterwards. With this method i'd take your sweet time, give the metallic paint layer a good, long time to cure before applying the second.
After that, take some very fine sandpaper and just 'wear' down the edges as desired
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