Hallo
Put an original sight on it. You will not regret it. The "QUALITY" of the originals is unserpassed. You can get them in an open notch type, or a peep, and they are markrd "R" for rifle, and "C" for carbine, on the side. The Italian sights just don't have as nice a finish, or notches in them, and some times the leafs don't lay flat, as do the originals.
You can find originals, on line at varios parts dealers. Google 45/70 springfield parts, or things like that.
Just my .02 cents.
Rebel Dave aka Dave C.
edit
Oops. Just noticed you ave a tang sight, I was talking about the barrel mounted type. Sorry for the mix up.