Uberti went to a taller front brass sight on the '51 conversions a few years back. I keep meaning to get some for my conversions, but keep forgetting. I'm used to the short ones though, and don't miss much so no biggie. I'm not sure if they put the taller ones on the percussion guns as well. And I don't know if that taller Uberti sight would fit on the Pietta, but that might be a possibility.