The scope bases (picatinny rail) vary in thickness. I have some steel bases that are 1/8" lower than an Aluminum base. Using the steel base with a high Burris signature z ring was the same as the aluminum base with a Burris medium height ring. Also a Burris medium is the same height as a Warne low ring. To make it more confusing Burris measures their rings differently than other manufacturers. I suggest you buy your base and rings from a seller that allows returns.
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