The manufacturer normally will have documentation for height based on either the distance from the top of the base to the bottom of the ring or from the top of the base of the mount to the center line of the ring. Using some calipers to get the diameter of the objective and the diameter of the barrel below the objective rounds out the data needed for a zero moa rail. After that it is working out the numbers. Most people do not want to go the that trouble.. Even calculating the slope for the 20 moa is as easy if you think about it.
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