ears ago they made a "Swing Over" set up .I can't remember who was making them or actually what they were called. The rings were attached to a base and basically it had a swing joint that you would roll the scope over to the side.That let you use the the iron sights.I'm sure some of the old timers would remember these. I haven't seen them in several years.
Weaver made a set of them like that. I have an old set of them in my junk drawer that I removed from one of my rifles. They are very solid, but I found them pointless because the iron sights that are put on most sporting rifles pretty much suck.