The Holosun HE510C-GR is an open reflex sight with green dot reticle designed for rifle and carbine use. The HE510C-GR is made with out of aluminum with a titanium hood. The HE510C-GR has three reticle options: a 2 MOA green dot, 2 MOA green dot with 65 MOA circle, or a stand-alone 65 MOA circle. The three reticle options make this optic a great choice for those with astigmatism or those seeking flexibility. The HE510C-GR has 12 brightness settings, 2 of the settings are night vision compatible. At setting 6 the HE510C can provide up to 50,000 hours of life on a single CR1632 battery. Holosun Solar Failsafe technology ensures usage after battery drain, while Shake Awake technology activates the LED upon motion detection and deactivates the LED after periods of motionlessness. The Holosun HE510C-GR weighs 4.94 oz.