A few years back I rigged my Uberti 1866 with the Lyman N0.2 tang sight, with the issued insert. At a match, with BP, on a mover on a line, rapidfire, I couldn't see well enough for subsequent shots. Too much smoke, if that is possible!
The next time, I removed the insert and Lo! I could see! So I tossed the insert and never looked back.