I am quite confident that this rifle was made by Daniel Fisher, in New Salem, Pike County, Illinois, right where your friend's GG Grandfather bought it. I own three of them and have seen several more. In the "Addendum" section in the back of Gunmakers Of Illinois, 1683-1900, Vol. II , page 478, is a double-keyed halfstock rifle by Daniel Fisher that has an identical patchbox. The stamp on the barrel of your friend's rifle is "D. FISHER" and appears identical to the stamp on other known rifles. Daniel Fisher was born in Ohio, circa 1813, and was in Pike County, Illinois at least as early as 1844. He was listed as a gunsmith in New Salem, Pike County, Illinois (not to be confused with New Salem, Menard County) in both the 1850 population census and the 1850 industrial census. He made 12 rifles during that year. Fisher died while still in business, on October 31, 1855. His estate inventory listed numerous gunsmith's tools, and there were bills against his estate from four other gunsmiths who had been employed in his shop from time to time.