sorry if I'm breaking the rules I'm new to this board but not new to allot of boards. I know some don't like you posting links if I'm wrong it'll never happen again.
after about an hour and a half of searching this is all I can come up with
Don't worry about posting links, believe me if the MODS have problem with something you post they will let you know.
Have you thought about just getting another muzzleloader that is already drilled and tapped for a scope?