Holosun HE509-RD Enclosed Solar Powered Red Dot Sight - 507C Plate - ACSS Vulcan Reticle

Take your pistol performance to the next level with the Holosun HE509 ACSS Vulcan Red Dot Sight—a precision-engineered enclosed optic built to eliminate hesitation and maximize speed on target. Whether you're a first-time red dot user or a seasoned shooter, the patented ACSS Vulcan reticle system transforms how quickly and confidently you acquire your sight picture.

At the heart of this optic is a revolutionary reticle design that solves one of the most common frustrations in pistol shooting—finding the dot. A large outer reference circle actively guides your eye toward the 10 MOA center chevron, giving you instant visual feedback if you're off alignment. Once centered, the circle disappears, leaving a clean, distraction-free aiming point. The result? Faster target acquisition, improved accuracy, and more consistent shooting under pressure.

Built for real-world conditions, the fully enclosed emitter design ensures your optic stays clear and functional no matter the environment. Rain, dust, or debris won’t interfere with performance. Add in Solar Failsafe™ and Shake Awake™ technologies, and you get an optic that’s always ready—automatically adjusting brightness and conserving battery life without compromising reliability.

ACSS Vulcan Reticle System
Large outer guide circle directs your eye to the center chevron, eliminating slow sight acquisition

Enhanced Target Acquisition
Instant visual feedback helps correct off-center alignment for faster, more accurate shooting

Selectable Reticle Function
Outer circle can be disabled for a simplified sight picture and extended battery life

Enclosed Emitter Design
Sealed optic prevents water, dirt, and debris from obstructing the emitter

Solar Failsafe™ Technology
Maintains reticle visibility and auto-adjusts brightness using ambient light

Shake Awake™ System
Motion-activated illumination preserves battery while ensuring instant readiness

Extended Battery Life
Up to 20,000 hours on a CR1632 battery for long-term reliability

Durable Aluminum Construction
Hardcoat anodized housing built to withstand heavy use

507C Footprint Compatibility
Includes adapter plate for easy mounting on compatible pistol slides

Compact Lightweight Build
Just 2 oz for minimal impact on balance and handling

Specifications

• Reticle: ACSS Vulcan with 10 MOA chevron and outer guide circle
• Reticle Color: Red
• Magnification: 1x
• Battery Type: CR1632 3V lithium coin
• Battery Life: 10,001 – 25,000 hours
• Brightness Settings: 12 levels
• Night Vision Compatible: Yes
• Emitter Type: Closed emitter
• Material: Aluminum (7075-T6)
• Finish: Hardcoat anodized
• Adjustment Increment: 1 MOA per click
• Length: 1.78 inches
• Width: 1.22 inches
• Height: 1.14 inches
• Weight: 2 oz
• Mount Compatibility: Holosun 509 footprint / includes 507C adapter plate