Good point i suppose, there might be a disparity in force/shock between a reciprocating slide with a hard stop at the rear and a reciprocating gun with a spongy stop in someone's shoulder. And I suppose it's going to be hard to sort out beyond an educated guess which is more abusive. Crying shame Mossberg probably won't give us the down low on what they tried and how it fared when they were playing with the 940 optic cuts to say the Holosun fared best.I dunno if it is the same. Slugs obviously recoil harder but the optic itself is stationary and non-reciprocating.
I'd go with RMR on such project.