Pacecars,
The picture link you posted above is not a Riflesmith tang sight. It is one made for and sold by C.Sharps Arms Company.
They are good for hunting only as they do not have a true vernier scale on the staff/eyepiece.
http://csharpsarms.com/catalog-detail/53/Deluxe-Long-Range-Tang-w-windage.html
Pull your sight and check under the base. Let us know what you find.
Chris

Last edited by Sharps1874; 01/12/13.