What prompted my opening question was recent threads on side by side combination rifle/shotguns, capegun configuration. Scoped or unscoped. And how people cope or don't cope with using a shotgun barrel with a scope.

Traditionally with QD mounts it's assumed one takes on it off the scope depending on the barrel to be used. Might work sitting in a hochsitz, but here in Aussie, walking a field of a creek line, flushing a duck, or a rabbit bursts from the grass, no time to remove the scope. And when the fox is seen at 100 metres away, especially if it's running away, no time to lever in a scope in qd mounts. One should have time to spin up the variable scope power dial. Shooting that flushed duck or running rabbit on 1x with the scope.