My thought has always been that the half stocked Hawken rifles grew out of the liquidation in St. Louis of the guns from the Lewis and Clark expedition, and the sales of surplus, and rejected, 1803 pattern Harpers Ferry rifles there as well. We know the Corp of discovery gun were sold in St Louis, and they were flint, so why would a new made flint, half stock, rifle, be such a big step.
Hungry Horse