Somewhere I read that sometime after closure of manufacture, these rifles were sent west for use along the frontier at that time. Sometime much later they were gathered up and sent to St. Louis and then to shops where they were bored out smooth and converted to percussion. If you find one that is flint, but smooth, it probably was a conversion and retuned to flint much later. I was contemplating a purchase of one of these and after reading the above, declined it. This one looks legitimate to my eye; still cap & ball.
Dick