Re: Swapping optic between rifles.
Two different ideas...
Ditch the QD, look for a traditional style one piece. If the rails aren't identical, you may have to mess with the tension adjustment for the QD levers or might not grip with the same force repeatedly when switching between the two. A good torque wrench should overcome that.
Something I was considering recently... (I don't know how much forward clearance you need for your scope on the ar-10) consider a solid cantilever (or just slightly raised) base and pick up a set of nice rings that would suit clearance for both, again traditional not QD.
I was in a similar boat recently and decided that Quick detatch was not necessary (I do still own them) and wouldn't be as precise as torquing it myself. Switching a scope between different rifles let alone of a different style is gonna take a minute... For me, the added inconvenience of having to have a torque wrench handy and the additional minute it takes over QD levers is worth the extra confidence and precision. It's also not something I have to do on-the-fly. You will also get alot more for your money losing the levers.
I'm not bashing the idea, and I do use QD, but for this situation I wouldn't feel it's indicated. I gave this thought for a while and after consideration and discussion with other members I decided against it for myself. It may work for you though.
Good luck with your setup-