The HS510C is a versatile open reflex optic designed for long gun applications. HS510C is at home on carbines, PCCs, and shotguns due its durable design. HS510C features and aluminum housing with titanium hood for added shock resilience and includes a QD absolute co-witness mount (1.41” dot height).HS510C is packed with Holosun innovation including Solar Failsafe, Shake Awake, MRS (Multi-Reticle System), Red Super LED with up to 50k hour battery life, with 10 daylight and 2 night vision compatible intensity settings. A lower 1/3 co-witness spacer is available separately from Holosun dealers that increases the dot height to 1.63”.____________________SPECIFICATIONS2 MOA dot & 2 MOA dot surrounded by a 65 MOA circlea solar cell on top of the deviceShakeAwake12 illumination intensity levels, 2 of them are NVD compatibleParallax free50.000 hours of battery lifeWindow Size 0.91×1.26Dimension (in) 3.3×1.68×1.78Weight (oz) 4.94Housing Material Aluminum & Titanium HoodSurface Finish MAOAdjustment per Click 0.5 MOAW&E Travel Range ±50 MOAStorage Temperature -40℃~70℃Working Temperature -30℃~60℃Submersion IP67Vibration 1000G