From what I can see of your rifle, it is what is called a "Kentucky rifle" with curly maple stock. Based on the shape of the trigger guard's spurs, slight reverse curl at tip of front or "hair" trigger, and butt shape, the rifle may be from North Carolina. It's hard to see details on the lock plate, but it looks like it was originally a flintlock that was converted to percussion. The shape of the lock plate suggests it is from about 1825-1830 or late flint period. It is important to examine the top barrel flat several inches behind the rear sight, because that is where the gun maker would have signed the gun. If there are any initials or name there, even if worn or damaged, please post a picture of it, and we can better identify the rifle for you. Shelby Gallien