Rattle-canned the black, airbrushed the silver and copper. Liberally used a dark wash around the low points and barrel.

It’s ok - came out good enough for my kids Halloween costume. If I were doing it again I’d keep those low points black. That was…a decision.
I also got a little too confident after doing the silver and didn’t mask anything off while spraying the copper…dark wash to try to cover up overspray areas.

Only technical problem I had was after I switched to the copper the paint seemed to puddle after spraying and the air the kinda pushed it around. Same settings - but in hindsight I think I was painting MUCH closer to the surface and possibly using too much pressure for that close-in stuff.