I couldn`t find a tang sight so I went this route for Ol smokey and am very pleased.
My shootin eye centers instantly as a peep should, the open top allows for good view of target but the eye stays centered and good sight picture is retained..I give it a thumbs up. This sight is currently only made for muzzleloaders however I wanted to share my opinion of the product..
It does come complete with mounting base. I also put a hi-viz fiber optic up front, its very good in the dark woods and lo light..
P.S. WA State does not permit scopes on muzzle loaders.