Functionally, nothing that I'm aware of. I have never fired it and ammo: 577-450 or is it, 450-577 Snyder is a tad hard to come by. The rear sight is missing as well.
I think it would be a fun gun to shoot. That's why I'm considering a re-barrel. I have also considered .410 shotgun also. I believe that the British or Indians did that also.
Thanks and I will try to post some better pictures.