One more note, as a seperate post. Williams does offer a 3/8 dovetail mounted rear peep site. It look like this except for the mounting. This Ellett, uses the 2 screw holes. The dovetail mount would allow easy swapping from a scope to irons. But some times these dovetail mounts, like certain rings, have a problem with the round top on the RAR receiver.

I wonder if the 2 holes mounting is just a more solid attachment (or lower) or a solution due the rounded top of the RAR receiver?

The matching proper fit and height front is another key piece of the setup.

Thinking in terms of versatility, optional height on the front base and a weaver rail on that rear, with ability to swap iron and scope on the rear - would be nice. Maybe the best of all worlds.