Source for Anodizing

Does anyone know of a source for Hard Coat Anodizing? I have an older Gray Colt that I want to have refinished to make a black flat-top.

I’ve been watching the boards for a used gray upper and the only one I’m seeing are the complete upper going for around $550.

Thanks

best bet is USanodizing… they do great work

http://www.usanodizing.com/