My rifle was already drilled for scope bases of some type, using those holes I made a base that was milled to sit over the rib. This base was made to accommodate a Burris reflex sight. It works like a dream. Would attach a photo, however I house all my photos on my computer.

If you have a fairly long dovetail for the express sights, what I would do is make a blank that would fit the dovetail, drill and tap that blank then make a base that will fit the red dot or reflex sight that attaches to the dovetail insert. My choice for a site would be a very low sitting reflex similar to the Burris maybe a Vortex.

Bob