Holosun HE515CM-GR 1x 20mm Red Dot - The HE515CM-GR is a 20mm micro optical sight designed for rifle and carbine applications. Features include 7075 Aluminum Housing, Solar Failsafe, Shake Awake, 12 brightness settings, Holosun's Green Super LED with up to 50k hours battery life, Multi-Reticle System, QD mount, Kill flash, and Clear Lens Caps. Green MRS:2 MOA Dot; 2 MOA Dot & 65 MOA Circle; Up to 50,000 Hours Battery Life (Setting 6); 12 Brightness Setting: 10 DL & 2 NV Compatible; Convenient Tray Battery Compartment; Parallax-free & Unlimited Eye Relief; Quick Release & Detachable Mount;