Another pitch here for the Talley screw lock detachable (same rings/bases as those with levers, just a Torx screw on each ring instead of a lever). I have used them with no complaint for many years, including a backcountry DIY Alaska hunt with one rifle, two scopes, both pre-zeroed as insurance. My own tests have shown they return to zero almost perfectly, as Al mentions above.
I will accept the weight penalty for absolute reliability.
