If the data I'm looking at is correct, I think there are 25 mils of total adjustment. So if everything is aligned and zero is at the center of the adjustment range, there is 12.5 mils available for elevation which is close enough to the 13 mils allowed by the the ZS to not worry with 20 moa mounts. If your zero happens to be lower than center then 20 moa mounts would be required to get the most out of the 13 mil ZS range. If zero happens to be higher than center then you're good to go.
Does this sound correct?
