I have an Encore with muzzleloader barrel and 7mm Rem Mag barrel that I had done by Black Ice Coatings,
http://www.blackicecoatings.com/.
This coating was applied to all parts except the bore of the barrels. Scope bases,rings and sling swivel studs also done.
It has held up very well and was a very quality job.
I have two additional frames and five other barrels and plan to have all coated as funds permit.
Check them out. Very good guy to work with.