I did a bit of research before I got the Williams sight. And dry fitted it. Hate to admit it but my old eyes, and the existing buckhorn rear sight do not work well anymore. Using an adhesive may allow me to see how it shoots and how well I can see with the Williams before drilling and tapping. I am not unacquainted with peep sights; as I was on my college’s varsity rifle team back in ‘69-‘71.