Any of the aircraft and aerospace parts manufacturer's can refinish it exactly as you want....you will need to strip the receiver of course....choice of colors....about 100 or so.....I'm a retired pilot and have had lot's of small and medium parts for my airplane done......really a nice finish.....they dip it and strip it first, then re-color to your desired finish. Pick up a copy of "Trade-A-Plane" (three issues per month, newsprint) at Barnes & Noble...there are quite a few ads present that address this type of finish....Take your pick...
Merry Christmas to All......"Pray for our country".....