What makes the ARC rings so good? To me, those two hinges just look like extra complication?
They align well, making for no stress on the scope tube.
They have plenty of surface area for a secure hold.
The reticle does not change angle as you tighten the top bolt. This is huge to me. Saves me from much frustration.
They are precise and repeatable. I have removed and reinstalled my scope on its base with virtually no change in POI.
They don’t appear to have any of the negatives of the vertically split rings that are split all the way through, which makes them the only vertically split ring I will use for now.
All that said, there are much less expensive rings that work very well, but the ARCs are my current favorite.
John