Holosun HE507K-GR X2 1x 15x20mm Red Dot - 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. MRS: Circle Dot; 2 MOA Dot; 32 MOA Circle; Up to 50,000 Hours Battery Life (Setting 6); 12 Brightness Setting: 10 DL & 2 NV Compatible; Convenient Side-mounted Battery Compartment; Parallax-free & Unlimited Eye Relief; Designed for CCW;