Get the 503cu with the 65 moa circle. - Holosun Paralow 2 MOA Dot Red Dot Sight 1x20 mm

Get the Optics that have the circle around the dot. It is a lot better for fast Target acquisition. I have a few of these that only is that I bought when I was trying them out and I have sold most of them off in favor of Optics from holosun have the big circle. Right now I only use the dot only as temporary Optics if I just want to test the gun out before I get a permanent optic on it. So it is good if you just want to see how accurate the rifle is but shooting with the big circle is much much better.