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2)The Hellinghaus shotgun owned by Carson is dated by the Museum of the Fur Trade as circa 1840...
I think that comes from one of the Mountain man sketchbooks, which is kind of odd since the the original MFTQ article on that gun has the story of it being given to a soldier at the post where Carson died around the time of his death. Those sketchbooks had a lot of problems. To be honest, museum attributions are generally rather optimistic as to date and the Museum of the Fur Trade is no exception to that rule. History is also a work in progress and new info has come to light since they wrote those sketchbooks. For example, the southern flint rifle that they have in there actually dates to the 1850's or later.
I have not disputed that doubles were available or that the Hawken shop sold and repaired them with my posts above. My only intention was to say that they were much less common than NW guns in the West and more expensive than the trade rifles that they often went into debt to buy. A $12 trade rifle often went for $50 and up in the West. Fremont's purchase would have represented one of the more well-healed and the gun was purchased in St. Louis.
I have the Hanson book you mentioned and just unpacked it from a box. The earliest reference to a double gun being sold by the Hawkens that I can find in it is 1838 for a 'fine double barreled shotgun in case' on page 22. The list of advertisement you mentioned starts on page 73. The earliest mention of doubles is March 13, 1832 by Squire and Tyson of NY who list 'Flint and percussion fowling pieces and ducking guns of all kinds and prices, of single and double barrel.' There are several mentions of doubles in the list before 1840, but that does not change the fact that their are very few notations of double guns in western period literature and trade records.
There is nothing that says you can't carry one. However, if you portray a dirt poor company trapper or even a free trapper, they would be unlikely to be able to afford one during the period. They also would have been much more likely to trade their hard earned plews for a rifle.
Respectfully,
Sean