Just one other thought since nobody has mentioned it yet...are you REALLY SURE that low rings are really giving you optimum positioning on the rifle?? I only ask because even though using low rings where able can get the optic down closer to the bore, it also generally has an adverse effect on the AR platform which doesn't lend itself to low rings. This is due to the Receiver Extension (i.e. - buffer tube), which has no drop at the comb like a more conventional, bolt action rifle or other stock. Because of that, mounts that put the center of the optic around 1.25-1.45" off the top rail (due to a variety of factors, etc.), generally give the most optimum height for achieving a proper/comfortable position on the rifle and solid cheek weld. Lower mounts and rings can certainly be used as warranted by the individual shooter/circumstances, but I personally would think that you would be all sorts of out of position and perhaps even having to contort the rifle somewhat to get a good sight picture by going that low. Again...just a casual observation...no offense intended.