Well, apart from these ones ...Admiral-Badruck wrote: there are no military weapons that are metal colored in the CCCP so there will be none in my grot army...
http://upload.wikimedia.org/wikipedia/c ... ssault.jpg
OK, not shiny, as such, but still a metallic sheen. gunmetal then Badab Black (or Badab Black mixed with Asurmen Blue) would do it.