Late to the party, but I thought I would add my two cents.
I used to mount RMRs on top of ACOGs (TA11 and TA33). Zero using my dominant right eye and a chin weld, but rotate to my weak left eye for use. It worked OK. My PoI shifted down and to the left (if using compass directions, say 225 to 230 degrees) by between 1 and 2 inches at 50 yards, which I deem very acceptable.
I have since switched to offset RMR mounts (Arisaka, at 35 degrees), which are much handier in every way. But, I might prefer the RMR on top of a TA33 if I am trying to trim ounces off total rifle weight.
'That whole effort was held together by sweat, shame, and a tiny bit of pride.' -- Son of Commander Paisley
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