Primary Arms/Holosun HS507K X2 ACSS 2/32 MOA Mini Reflex Sight, Black

Primary Arms/Holosun HS507K Features and Performance

The Primary Arms/Holosun HS507K is a compact pistol red dot built through a collaboration between Holosun and Primary Arms, combining Holosun’s proven micro optic platform with the Primary Arms ACSS Vulcan reticle system. This version is designed for shooters who want a compact open-emitter optic for concealed carry and defensive handgun setups, but with a reticle optimized for faster dot acquisition and easier recovery from imperfect presentations.

Instead of the standard reticle found in a typical 507K, this collaboration model uses the Primary Arms ACSS Vulcan reticle. That reticle system is designed to help shooters find the aiming point faster by giving additional visual reference when the dot is not centered in the window. For carry pistols and fast presentations, that can make the optic especially appealing to users who want a more forgiving and intuitive sight picture without giving up the compact size of the 507K footprint.

Built from 7075-T6 aluminum with a hardcoat anodized black finish, this optic is designed for durability while remaining extremely lightweight at just 1 ounce. Its open-emitter layout helps keep the overall profile small, making it well suited for slim pistols and concealed-carry handguns. Night vision compatibility and 12 brightness settings give it added flexibility across a wide range of lighting conditions, from bright daylight use to lower-light environments.

Powered by a CR1632 3V lithium coin battery, the optic offers 50,000+ hours of battery life. With 1 MOA click adjustments and compatibility with the Holosun 407K/507K footprint, it is a practical option for shooters looking for a compact carry optic that combines proven durability with a reticle system developed specifically to improve handgun red dot performance. For more optics and firearm accessories, visit our accessories collection.

To learn more about this collaboration optic and related product information, see Primary Arms’ official product page and Holosun’s 507K product resources.