OK, I'll ask the question... what parts need to be heat treated, according to this local Alaskan gunsmith, and what makes him think they need to be heat treated?
You say everything works fine, so I am assuming that you aren't experiencing things like doubling due to worn sears, etc.
I think the first thing you should consider is finding a real good double gun gunsmith, and getting some hard facts about what is wrong, and what is sheer conjecture... possibly a knee-jerk reaction based upon the reputation of some Spanish guns having improperly hardened parts.
I agree completely with what Miller said about using Kasenit on high carbon steel. Anyone who knows anything about hardening and tempering would know that there is absolutely no need for a surface hardening compound on steels that, by their nature and composition, can be hardened and tempered.
I also agree with craigd about the possible cause for the gun being tight and difficult to open, whether fired or not. It looks to be in near new in box condition, as if it has seen very little use. A little break-in usage, along with some good lubricant, could make a world of difference.
