the DNZ mount is 1.375 so its going to be .125 LOWER than the standard ar 15 mounts out there. It also depends on the shooting position you use most often. for prone shooting lower is a little better. anything other than that, off hand, off a non attached bipod, I think a little higher is better, but we all hold the gun differently so just see what works best.
I have settled on an IOR Lo Profile Rider with a set of low rings. The riser is .416", while the rings are .150" to the saddle, so if my math is right, I should be at 1.06" to the center of a 1" scope. This puts a 50mm scope pretty damned close to the rail, and as close to perfect for me as I have found.
