Here's a little project I did last summer for my GHK. Not really a painted gun post, but they go in my gun so I'd say it counts.
GHK AK-74 magazines come stock with this HORRID orange colour.
I wanted them to look more like Bakelite.
(They look a little dark due to crappy lighting.)
I scratched the shells with sandpaper, put a light coat of Kona stain and then after put a coat of Red Mahogany. Last I covered in a clearcoat.