Well- to be clear I certainly understand the concept but my question is that more often than not there is NOT a true back up unless someone was carrying a spare scope. I have had 1/2 a dozen old rifles with removable scopes and not one had functional irons or a peep. I am aware things get changed or lost over the years.
I had a Winchester 54 Super grade with G&H mount and the rear site had been replaced with a blank ( likely for the scope bell to clear ) Etc etc.
DEr Ami and Vail. Thanks I hadn’t considered the removal purely for safe travel or a rough hike- certainly valid.
BrentD - two scopes surely an option but I haven’t seen any “sets” I recall being sold that way, though I did put one together myself with nice matching B&L scopes one 1.75-6 close range and the other 4-12 long range.