Close to perfect - American Defense Manufacturing AD-Recon-S 20 Dual Ring Straight Up Scope Mount

Excellent build quality and finish. Leveling the scope was easier than a conventional split ring, and the design inherently aligns to the tube for better contact. Adjusting the QD levers is simple, and lockup on a rail is solid. You can truly set your zero, remove, and reinstall without losing zero. Very impressive. The deduction of a star is due to the design of the rings. With the screws securing the halves together being located above the scope tube, there has to be a lot of material on top, and it completely blocks the line of sight to the turret. Unless you are absolutely sure you counted the right number of clicks, you will have to raise your head entirely off the weapon to look down at the turret markings. For me it's a minor inconvenience, but for more competitive shooters, that could be a problem. Other than that, I can't think of a thing I would change, and will buy more when the need arises.