I just received a Nikon ProStaff from Midway. I had heard about return to zero turrets but did not understand myself. And I was surprised when I took the caps off to see the knobs and how they worked. ( I had to read the instructions.) But the way I understand them,, you zero your rifle,, then you can pull up on the turret knobs and turn it back to the zero mark,, then release it and it locks back into place. It seems to work pretty slick,, though I have not got it mounted on a rifle yet. I just think it is a pretty nifty setup.