Thanks for posting these! When we were manufacturing the trade guns in the early 70s, I did not set one up for myself. Kept some parts, and put this one together over 20 years ago. We were manufacturing from scratch, and had dies made for wax casting the lock parts, breechplug, serpent, trigger and trigger guard. Sold some of our serpents to Dixie. Barrels were machined from .58 x 1 3/16" diameter x 36" 1137 steel blanks. 2 1/2 hrs from blank to breeched barrel, all machining done on a 16" South Bend. The lock original was an unused American Fur Company lock borrowed from Charlie Hansen at the Museum of the Fur Trade in Nebraska. The hardware patterns were from a really fine specimen from about 1812. It had been converted to cap, but its lock would have been unsuitable, because it was not bridled in or out. We had this gun cast in aluminum, for use as a pattern for the stock carving machine. We carved stocks on a North Star carving machine for a while, but then sent our pattern to Fajen, and they did them for us.
Someone else borrowed the same lock, and cast lockplates from it, with the original tombstone fox IA mark. I have one of these, got it out of curiosity.
When I set this one up, I did not have one of our barrels, so used a 30" NorthStar, and carved the stock from a 2" cherry plank. Didn't have any plans, shaped it from memory. Overall, the gun would be typical for the 1840s; the NWCo marks are wrong for that period, of course. Our plate castings were blank, we stamped them with the circle fox and Barnett.
Trade guns I've handled have enough drop to be able to aim them. They will also stand up, if you set them on their butt. The drop and pitch are such that they will stay standing.