It is a guess, until you mount the optic. Best way is to buy it and then using something under the mount, build it up to the height you want, and measure the build up. That the riser height you need. Depending on the optic and sights, I have used from 1/2 inch to 1 inch high risers.
Bob
Last edited by robkarrob; 04-22-2014 at 10:31 PM.
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