I am in the process of swapping out a 1" tube scope to a 30mm tube scope on one of my rifles. I had the Leupold 1" STD rings and bases on the rifle with the old scope. For the new one, I figured that I would just switch to 30mm STD rings, and keep the STD bases I had. Well when I went to insert the front twist-in ring, I found the the dual dovetail on the new 30mm ring won't fit into the base. Am I missing something here? I thought that STD bases were for use with either 1" or 30mm rings?????? It is probably just my wonderful luck that I got a set of rings that slipped through the person working quality control's fingers!