Description
This open reflex sight delivers EOTech-style performance with three reticle options, solar backup power, and absolute co-witness mounting at a much more affordable price.
When rapid target acquisition meets extended battery life and versatile reticle options, you get the HS510C-FDE. This reflex sight combines a generous 1.26″ × 0.91″ window with Holosun’s multi-reticle system, giving you the flexibility to switch between a 2 MOA dot, 65 MOA circle, or both combined without re-zeroing. The integrated solar panel works alongside a CR2032 battery to deliver up to 50,000 hours of runtime, while Shake Awake technology automatically powers the sight on with movement and off during extended periods of inactivity. Built with an aluminum housing and titanium hood for shock resistance, the HS510C-FDE mounts via quick-detach hardware to any Picatinny rail at an absolute co-witness height of 1.41 inches.
Key Features
- Three Reticle Options in One Optic: Multi-Reticle System allows instant switching between 2 MOA dot only, 65 MOA circle only, or combined circle-dot reticle using the same LED emitter with no need to re-zero
- Dual Power System: Solar Failsafe panel supplements CR2032 battery power in adequate lighting conditions, with battery life reaching 50,000 hours on brightness setting 6 using the 2 MOA dot
- Motion-Activated Operation: Shake Awake technology automatically powers on the reticle when movement is detected and enters sleep mode after extended inactivity, conserving battery while keeping the sight instantly ready
- Wide Field of View: Open reflex design with 1.26″ × 0.91″ window provides unobstructed peripheral vision and rapid target acquisition for close-quarters to mid-range engagements
Important Compatibility Notes
- Designed for carbines, pistol-caliber carbines, shotguns, and AR-platform pistols with Picatinny rails
- Too large for standard pistol slide mounting
- May require riser on certain shotguns with straight-line stocks
- Compatible with 3X magnifiers when using the 2 MOA dot reticle setting
Why We Carry It
The HS510C challenged the market by offering features typically found in optics costing twice as much, including the titanium protective hood normally reserved for premium sights. The 65 MOA circle serves double duty as a rangefinding tool: at 100 yards, an average-height adult fills the circle from top to bottom, while at 200 yards, they fill from the center dot to the bottom. This practical feature originated in military holographic sights and provides instant range estimation without training. Professional shooters in USPSA PCC divisions have increasingly adopted the HS510C over traditional tube-style red dots, citing the combination of open viewing window and battery longevity as decisive factors for competition use.
Frequently Asked Questions
Will this sight work well if I have astigmatism?
The HS510C receives mixed feedback from users with astigmatism. Many report that the 65 MOA circle reticle appears clearer than a simple dot, and some find the circle-dot combination helps them maintain sight picture despite dot distortion. However, users with severe astigmatism note that the reticle can appear as double images or starbursts, particularly in the dot-only mode. The Multi-Reticle System allows you to test different reticle configurations to find what works best for your vision.
How do I install the battery correctly?
The CR2032 battery must be installed with the positive side facing DOWN, which is opposite to most electronic devices. This is a common point of confusion and is emphasized on Holosun’s warranty service page. The battery compartment is located on the side of the sight with a tray design that requires two screws for removal, preventing accidental battery loss during recoil. If your new sight appears non-functional, place it in bright sunlight or artificial light for several hours to charge the internal supercapacitor before use.
Can I mount this sight directly to the rail without the included QD mount?
No, the HS510C requires the included QD mount for installation. Unlike some Holosun pistol optics that mount directly to RMR-pattern cuts, the HS510C is specifically designed to work with its included quick-detach Picatinny mount system. The mount is considered an integral part of the sight assembly.
Spec Sheet
Optical Data
- Reticle: 2 MOA Dot & 65 MOA Circle
- Light Wavelength: 650nm
- Reticle Color: Red
- Parallax Free: Yes
- Unlimited Eye Relief: Yes
- Magnification: 1x
- Multi-Coatings: Yes
Electronic Data
- Power Source: CR2032 Battery
- Battery Life: Up to 50,000 Hours
- Brightness Settings: 10 Daylight & 2 Night Vision
- Solar Failsafe: Yes
- Shake Awake: Yes
Mechanical Data
- Housing Material: Aluminum & Titanium Hood
- Surface Finish: MAO (Micro Arc Oxidation)
- Adjustment per Click: 0.5 MOA
- Windage & Elevation Travel Range: ±50 MOA
- Mount Type: Quick Detach
- Dot Height: 1.41″
Physical Data
- Window Size: 0.91″ × 1.26″
- Dimensions: 3.3″ × 1.68″ × 1.78″
- Weight: 4.94 oz
Environment Data
- Storage Temperature: -40°C to 70°C (-40°F to 158°F)
- Working Temperature: -30°C to 60°C (-22°F to 140°F)
- Submersion Rating: IP67
- Shock Resistance: 1000G
IN THE BOX
- Absolute Cowitness QD Mount
- T10 L Key
- User Manual
- CR2032 Battery
- Lens Cloth
