another way to go could be that williams sells a dovetail slot with a threaded hole in it, you fit the slot to the barrel dovetail then you can screw a ramp to the slot, then fit a dovetail insert sight to the ramp. Jimbo's right....you need an over all height of .620 above barrel to make the wgrs work. FYI brownell's sells sight blanks (post type,either .100 or ..080 wide post) that you shape and fit with a file that sell for less than 10 bucks. They come unfinished( steel,in the white) and after i fit em to the ramp and to the height i need a little flat black rattle can spray paint makes for a good finish. Sounds difficult but it's not...a good DIY project.....Mike