The HE507K-GR X2 is an open reflex optical sight designed for concealed carry 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 compliment the Lock Mode by placing them lower and out of the way. Additional features include Holosun's Super Green LED with up to 50k hours battery life, Multi-Reticle System, and Shake Awake. Features:Circle Dot reticle with 2 MOA dot and 32 MOA circleUp to 50,000 hours of battery life (setting 6)12 brightness settings, 10 daylight and 2 night vision compatibleConvenient side-mounted battery compartmentParallax-free & unlimited eye reliefDesigned for CCWHolosun K Footprint