From what I've gathered reading posts on the matter, you're best off staying away from cantilever-style mounts. Sounds like the forward bolt force may be amplified by them, transferring more energy to the scope. First step, purchase a quality optic. I'd look at ADM, Larue, and Bobro if you want QD. Of the three, ADM's RECON-S will probably be the lowest price/lighter option. Their Delta is the one to get for robust-ness (that word is all the rage nowadays). Visiting the sites should get you the weight answers you're looking for.
Warne QD rings might be worth a look.