its the same thing as asking if anodizing a receiver can be done.......
depending on the metal you can plate it.....pot metal is really hard to plate thow.... because you'll need a layer of copper oxide first(aka Flash copper)(because of the oxidation of potmetal) or another potmetal primer kit (nickel), then you could plate anything over that.....and alot of people recommend "sandblasting' the potmetal pieces before plating them with copper....
all other metals are relatively easy to plate, you can even buy your own "plating kit"!! :P
Link:
http://www.caswellplating.com/index.html
http://forum.caswellplating.com/plat...py-chrome.html