The barrel length, based on current location of rear sight, was probably 4 or 5 inches longer originally. Those longer barrels usually came from states farther west. The slightly "clunky" look of the triggers suggests Ohio, but that's not enough to place the gun. Two additional details that may help identify the gun are: 1) good picture of lock bolt washer on back side of gun, and 2) good picture of tang. Those two items often varied depending on where the gun was made. But these later ca. 1845-1855 half-stocked rifles, without artistic details to show a maker's hand, are hard to place at times.
Shelby Gallien