If you are looking for an alternative to the Aimpoint T2 optic, check this review by the Bavarian Shooter of the Holosun HE515CT-RD... "My video about the HE515 CT-RD from Holosun. The optics convince with the typical Holosun features as well as a bombproof construction in the well-known and popular Aimpoint T2 format. In my opinion, it is the best optic that Holosun is currently selling."