I don't think this gun was ever flint. The single lock bolt, and the hogged out lock mortise, make it unlikely. I also don't think this is a product of the Hawken brothers shop. The iron fittings are too crudely fashioned for their work. The drum looks suspiciously like the rectangular boss on its end has been welded up and dressed with a file. The lock plate, and hammer, look like new parts, aged to fit the rest of the gun, with no pits, or major dents, and nicks.
Hungry Horse