Holosun Technologies HS510C, Reflex Sight, Multiple Reticle, 65 MOA Circle, 2 MOA Green Dot, Aluminum Housing, Matte Finish, Flat Dark Earth, Solar with Internal Battery HS510C-GR-FDE The HE510C-GR is a versatile open reflex optic designed for long gun applications. HE510C-GR is at home on carbines, PCCs, and shotguns due its durable design. HE510C-GRfeatures and aluminum housing with titanium hood for added shock resilience and includes a QD absolute co-witness mount (1.41" dot height). HE510C-GR is packed with Holosun innovations including Solar Failsafe, Shake Awake, MRS (Multi-Reticle System), Green Super LED with up to 50k hour battery life, with 10 daylight and 2 night vision compatible intensity settings.