There isn't much of a color selection unless your into earth tones. I would not imagine that many folks would want a bright red receiver. It's not cheap either. However, either one of these should be able to stand up to gas and carb cleaner.
Brownells Teflon Molly Oven Cure Gun Finish
Brownells Aluma-Hyde II
Brownells Teflon Molly Oven Cure Gun Finish
Brownells Aluma-Hyde II