Me too on the Marble Tangs for my .38-55 Marlin Cowboy and a .357 Model 92 Winchester clone. They are good sights for the money. I keep extra apertures in my gun kit for whatever reason I can imagine, but usually only use the front sight. I flip the pivot up and shoot without the screw-in aperture at ranges 20-50 yards. The SASS ranges are not very far except for the 100 yards-and-up side matches, so then the "target aperture" comes into play, especially for the .38-55.
Minor complaint: the mount covers the serial number, which is not Marble's fault.
