Interesting idea, one thing that would throw the findings off besides atmospheric conditions woul be a scope that was not perfectly centered in the rings.
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Thats a interesting thing to test... will see!!!
What I can assume from your finding is that Fx has used O-rings to eliminate or minimize the indexing issue. This brings up another question, does the position of O-rings on the liner effect the POI. Let's suppose liner is 24 inches long and four orings are placed at 4 inches apart while the first the O-ring at 4 inches away from the breach. If the orings are moved further apart or closer will that change the POI or indexing?