Primary Arms 507K, Red Dot Sight, Red ACSS Vulcan Reticle, Anodized Finish, Black, RMR Footprint HS507K-X2-ACSS Created through a collaboration between Holosun Optics and Primary Arms Optics, the red-illuminated HS507K-X2 with the patented ACSS Vulcan Dot Reticle brings the revolutionary Vulcan aiming system to a micro reflex footprint. Designed for concealed carry, the HS507K-X2-ACSS is lightweight, durable, and dependable, with up to a 40,000-hour runtime on medium settings. This sight retains all the core features and technologies of the standard Holosun model, including the Multi-Reticle System, Shake Awake technology, and a built-in Lock Mode. With 12 red-illuminated brightness settings and intuitive push-button controls, the HS507K-X2-ACSS performs in any lighting condition and is compatible with night-vision devices.