Now, the version I bought had the docter MRD on top. I took that off after my first trip to the range. The MRD kept hitting my eye protection and it was super annoying. Not only that, but the MRD on top of the ACOG is so far above the bore centerline, that you practically needed to aim for the chin if you wanted a center of mass shot(within 25m). Also, the fiberoptics are too bright on the ACOG. So, I covered up about 3/4 of the exposed fiberoptic with 100mph tape and left a little pull tab at the end for minor adjustments. This prevents blowing out the crosshairs with too much brightness, but still keeps it illuminated. Personally, if I did it over again I would buy the version with crosshairs and tritium instead of the fiberoptic. Also, I prefer the crosshairs over the chevron, donut, or any of the other reticles.