I have Guide Gun that is ported.

I am toying with the idea of putting a 20 inch octagon barrel with a matching feed tube on this rifle and color case hardening case the receiver sand the butt plate,

Who would be the best gunsmith to go to far as information for this type of project?

Thanks

Rob

With the case hardening Turnbull is near the top.
http://www.turnbullmfg.com/