This rifle looks very much like it was made in Louisville, KY, or close to that area. Specific details which suggest a Louisville area product are:
1. guard with a "square shoulder" where it runs up to meet rear extension,
2. thin butt with clean, straight lines in comb and toe,
3. long tang... it's hard to see, but based on "slight" view of rear of tang, appears to be a longer one, possibly with two screws, in KY fashion,
4. typical nose cap treatment where it sits several inches beyond the rear ramrod pipe,
5. rather slim, even width side facings around lock, without the extended or tapered nose or tail in side facings often seen in more eastern rifles,
6. extended butt plate heel, often seen on Louisville percussion rifles of the 1840s and later.
7. guard with very oval shaped bow
I also recommend looking closely at top barrel flat several inches behind rear sight, to see if any trace of initials or a name remains on the barrel. If so, we can probably figure out the maker on this rifle.
Shelby Gallien