Rival Arms RARA8122BN: The X2 Reflex Sight is a 2 MOA Red Dot optic with a 22mm Objective. This model features a Motion Sensing Automatic on with 10 power settings, 8 Daytime and 2 Night Vision capable options. This model also uses a memory system of the last used brightness setting after it is reactivated. Low and High AR Absolute Co-Witness Picatinny Rail mounts included.