I bought this as an unrestored as-is piece about 10 years ago. Originally I bought two, hoping to end up with one good rifle to give as a present to a friend. I was fortunate and ended up with two! His was non-firing due to some damage but mine is intact.
This can probably be fired, though I have not. It has the .45 bore, not .50 as English MH’s do.
Folks have made shells from 16ga brass shotshells, but I never tried.
I cannot guarantee this is in firing condition, but I believe it is.
Asking $350 (price drop from $400) plus shipping. I can ship this through the post office since it is an antique.