Check Grant's post, my point was that any two-optic combination is sub-optimal, whether on top or offset at 45 degrees. Sorry I should have been more clear.
In my opinion that is a distinction with only negligible difference. Either way it doubles the complexity for most users.I agree that the piggy-backed MRD on top of an ACOG (or anything really) is sub-optimal. It requires a LOT of repetition to become habitual to go to the higer LOS, and even then people tend to get lower on the stock under stress and drop into their magnified optic. Either way, the line of sight over bore is terrible for close-range work.
What is a viable method is to mount the MRD offset from the magnified optic, but at about the same height over bore so that all you need to do is cant the gun slightly inboard to work the MRD at close range targets.
In addition from my perspective the low-powered optic should be the primary as that will get the most use, offset relegates your most useful sight to a sub-optimal location.
Basically the 45 offset or direct piggyback is far from ideal and I think one is better off sticking to one optic and mastering it given limited training resources.




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