The HE515GM-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 RSR - CMMG55DA525