Hello, Sweet Shooter. NECG offers ramp front sights..barrel band, & screw-on front sights for the Ruger No.1 and others. It only requires 1 screw hole. Their rear appature slides onto the 1/4 rib & is held by set screw.
Most if not all of the older american single-shots..Winchester, Remington, Ballard, Stevens, Etc. were drilled & tapped for tang sights
Some of the early bolt actions had optional bolt mounted peep sights.
It is too bad there are no longer quality rear sights on the market. From the early 1900's up thru the early 60's, nearly all the major sight makers had quality precision sights available..most bolt guns were drilled and tapped for the Redfield or Lyman appature sights.
I wonder how many younger guys have ever handled a bolt action rifle without a scope..I have a 7X57 pre-war sporter with claw mounts..when that scope is removed..and this is quite a bit smaller & lighter than most scopes used today..that rifle becomes alive..nearly like a well balanced side by side shotgun!