If I read it right, none of the two I listed needed tapping, just like the one you found (cheaper $). I got a scope mount for my Ruger Blackhawk that is installed the same way, so far has held zero.Well I found one from EGW and it shows removing the rear site and drops right in.
https://www.mountsplus.com/egw-sigh...re-vortex-venom-viper-for-ruger-revolver.html
After I posted this one I read the reviews of which there were only 3. 2 weren't good and 1 was so who knows.If I read it right, none of the two I listed needed tapping, just like the one you found (cheaper $). I got a scope mount for my Ruger Blackhawk that is installed the same way, so far has held zero.
Thisjackweigand.com