I just finished reading "My 60 years on the Plains " (available as a free download on Google books ). The author mentioned that his group of trader/trappers each had a rifle and 2 Colts pistols. He said that the additional 12 shots were handy in fights with the Indians. The fights took place from 1842 to 1845. I thought the only Colt in production then was the Patterson 5 shooter. Corrections welcome.