Stop in for a cup of coffee
And someone should be selling it north of the border. Its shame there's such a limited selection of finishes on fasteners these days. The only thing that looks worse than a modern screw on historic hardware is one that contrasts with it. grump grump.
I forget what gun bluing usually is. IIRC browning is something or anything that creates light oxidation. Frank - Google some blacksmithing and metal working suppliers and forums. Maybe later I'll remember where I've seen this info.