There is no question, the change to the percussion system was a few years behind in the "West". The "West" being any state that wasn't on the Eastern Seaboard, at that time. During the Blackhawk War, at the Battle of the Apple River Fort (Jo Daviess County, Illinois), in 1832, there was only one percussion rifle involved. It was the first one that most of the fort's defenders had seen, and was unusual enough for the writers of local history books to have noted. The fact that the rifle's owner was to become the only casualty of the battle, probably didn't advance the popularity of the percussion system in that area. On the other hand, I have a rifle made by Thomas Hunt, in Peoria County, Illinois, dated Feb. 21, 1833, that is definitely original percussion. Hunt came to Illinois from Ohio in 1831. Several years ago, there was a Thomas Hunt rifle displayed at our Prairie State Longrifle Show, that was also original percussion, and was dated 1828. Apparently Hunt was on the "cutting edge" of this technology. Hunt died in Peoria County, Illinois, in 1836. Shortly before his death, he made a rifle for his brother-in-law, which was flintlock. If the customer lived in an area where percussion caps were not always readily available, he would be a bit reluctant to make the change.