I have that sight on an H&R 1871:



The sight works very well on this rifle, but I also have a globe front sight with it. this is how this gun came from the factory. But like you said, notice how far back the sight is mounted.

This is a .38-55 that I only shoot BP in it. It is a hoot to shoot and wanted to take it into the woods this past year for deer season. I forgot to through it into the SUV and thought about it when I was in the tree stand. I will take it next year.