Is that a Yazel ?? Spelling?
I have a back action in line 45 cap lock that was built around 1974 by a smith in Ohio, I think, looks a lot like your flint. It also has a false muzzle, if I could hold it still it would shoot. Very nice target by the way, and with a flint. Looks like a 98 2X scores like that should place most every time.
Illegitimi Non Carborundum