I almost bought one for my Guide Gun. It is heads and shoulders above the Lyman tang sight. Very high quality. Unfortunately my serial # is on the tang where the mounting holes need to be drilled and tapped. It would be illegal to "alter" the serial # so I went with a Wild West ghost ring sight. I didn't feel like having the serial # moved.
If the serial # issue isn't a problem go for it. It's a great sight.