My thought was Prussian 1809, they converted a lot of them in the 1850's because needle gun production was slow. But it seems to lack the swivel attachments on the rings that European military imports used to have. And I agree with HH, the front band seems wrong for a military rifle, they all had protective caps to reinforce the end of the shaft where you inserted the ramrod.
I used to love being able to hit hard at 1000 yards. As I get older I find hitting a mini ram at 200 yards with the 22 oddly more satisfying.