Help please: Sig 55X parts and refinishing.

[I LIKE IT!]

I wanted to know who in the U.S. is highly reputable/skilled in doing any kind of work on the Sig 55X line of rifles.(a Preban Sig 551 in this case)

I need someone who can provide genuine Swiss parts and or do a clean/accurate Swiss Gray refinish.

Edit: So far I've taken notice of Turner Fabrications,Colorado Gun sales and MarColMar though I don't know of their reputation.