So much for that suggestion. I’m sure not going suggest that you add any holes to such a nice rifle.

The Williams receiver sight is the only one I know of that mounts to the rear scope mount. A wacky possibility is the Williams Quick Convertible scope mount with the aperture sight option. There are a few aperture sights designed for rail mounting. You might get one of those to work in the slot of a Weaver rear scope mount base.