I believe that gun was built by Mark Elliot - if you go to the ALR Home page above you will find a link to his website with photos of more guns of that style (real nice work, too!). It is a southwestern Virgnia late flint ("mountain") rifle. A similar rifle could have hailed from just about anywhere in the southern Appalachians near where Virginia, Tennessee and North Carolina border up against each other, in the 1820s or later era.
Guy