Listed under Specialty Restoration, Pricing, Metal Restoration Prices:

Double Gun Restoration Barrels slow rust blued. Frame is case colored (torch method). Smalls parts hot blued. All internal parts cleaned $275.00

This is cut and pasted from his site. Now yall debate the merits of this work, I would not have it done to a klunker I wanted to sell, much less to a gun I planned on shooting with my fingers wrapped around it.