HOLOSUN HS507C-X2 Black Anodized 1x 2/32 MOA Red Circle with Dot ReticleThe Holosun HS507C X2 is an open reflex optical sight designed for pistol applications. The X2 Series pistol optics feature two improvements. First is the addition of Lock Mode from the 2018 2019 LE pistol optic models. Lock Mode, when activated, locks the buttons preventing inadvertent setting changes. Second, the buttons have been redesigned to complement the Lock Mode by placing them lower and out of the way. Additional features include Holosuns