The Holosun HE507C-GR-X2-ACSS is a new generation of pistol red dot sight packed full of features like the multiple reticle system solar failsafe and shake awake technology to ensure your reflex sight is always operational when needed. On top of the two battery-saving techniques the HE507C-GR-X2 reflex sight features up to 20 000-hour battery life on setting 6 with the CR1632 battery. This battery is located in a convenient tray that slides out and allows you to easily change it without having to remove the optic from your pistol. This model features the revolutionary patented ACSS Vulcan reticle with an outer circle. It features 7075-T6 aluminum construction with an anodized black finish and fully multicoated glass for long-term durability that is backed by Holosun’s limited lifetime warranty. The ACSS Vulcan Reticle is a revolutionary approach to reflex sights giving the optic AutoAim functionality by improving user agility through a ‘heads-up’ target acquisition. Under duress standard reflex reticles can be lost without proper sight alignment. With the ACSS Vulcan reticle users always know the relative location of their aiming point allowing for quick correction and improved accuracy on target.