Gunmetal

Gunmetal:

I've used #53 from Humbrol (an oil-based gunmetal) and I _still_ think
it is the best gunmetal I've ever used. I've used Tamiya Gunmetal, but
find it too dark for my taste. I've got Armory paints, I've got RP
Paints, I've got other Testers, Tamiya and Humbrol paints, but that one
little can of #53 is my favorite. 

It all depends what you look for. There is good argument for suggesting
weapons of 2183 are all acrylic anyway and so should probably be painted
in whatever colour you want (in fact, a phototrophic camouflage coating
like you have on your cammie-jammies might make sense). Heck, even today
some folks camo paint their weapons (specifically sniper types)
sometimes.