Red Dot Features The Holosun 510C is an open reflex red dot optical sight designed for rifle and carbine applications. Features include Holosun's Super LED with up to 50k hours battery life (powered by a CR1632 battery), Multi-Reticle System (2 MOA dot and 65 MOA outer ring or 2 MOA dot only), absolute cowitness quick release mount, Solar Failsafe, and Shake Awake with last setting recall. Housing is 7075 aluminum. 3X magnifier Features The Holosun HM3X is an aluminum bodied 3X magnifier that includes a quick release, ambidextrous, flip-to-side mount with Absolute and Lower 1/3 Co-witness mounting solutions. Additional features include 2.75" of eye relief, IP67 certified water resistance, with windage and elevation adjustment for precision zeroing. Manufacturer part number: HS510C+HM3X Combo