Your rifle is a nice example of the late flintlock period, probably dating to the 1830s, maybe later. Looks somewhat like an Upper Susquehannah River rifle or a little to the East of there
in the Reading area. Patchbox gives an appearance of a Lehigh gun, and it could be the case.
Is there a signature, or initials on the top barrel flat? Anywhere else? How long is the barrel?
Nice rifle and thank you for letting us have a look at it.
Best-Dick