Holosun HS510C Red Dot Open Reflex Sight, MRS

The Holosun HS510C Red Dot Open Reflex Sight is an open-frame, non-magnified red dot optic designed to deliver fast target acquisition and reticle flexibility on carbines, PCCs, shotguns, and rifles. Featuring a 2 MOA red dot and a 65 MOA circle, this optic uses Holosun’s Multi-Reticle System (MRS) to adapt quickly to different shooting distances and applications without changing zero.

Built by Holosun, the HS510C is engineered for shooters who want a durable, solar-assisted optic for working rifles and sporting platforms. Its open-reflex window provides a wide, unobstructed sight picture, while the reinforced housing ensures reliability under recoil and field use.

The HS510C is designed as a versatile primary optic for long-gun platforms. Its Multi-Reticle System (MRS) allows the user to switch between a precise 2 MOA dot, a large 65 MOA circle, or a combined circle-dot reticle, making it suitable for both close-range speed and more deliberate aiming. The optic operates primarily on Solar Failsafe technology, automatically adjusting to ambient light conditions, with a user-replaceable CR2032 battery serving as backup power. A parallax-free design and unlimited eye relief allow effective use from unconventional shooting positions.

Key Features

• Multi-Reticle System (MRS): 2 MOA red dot, 65 MOA circle, or circle-dot combination

• Solar Failsafe power system with CR2032 backup battery

• Up to 50,000 hours of LED life at setting 6

• 12 brightness settings: 10 daylight and 2 night-vision compatible

• Open reflex window with wide usable viewing area (~0.91 x 1.26 in)

• Quick-release mount with absolute co-witness height

• 0.5 MOA per click adjustments with ±50 MOA windage and elevation travel

• Shake Awake technology conserves power when not in use

• Parallax-free optic with unlimited eye relief

Specifications & Construction

• Magnification: 1x

• Housing: Aluminum body with titanium protective hood

• Finish: Black MAO / anodized

• Optics: Multi-layer reflective glass with multi-coated lenses

• Adjustment Increment: 0.5 MOA per click

• Environmental Rating: IP67 submersion rated; vibration rating listed at 1000G

• Power Source: Solar primary with CR2032 battery backup

• Mounting Interface: Integrated Picatinny (1913) / Weaver-compatible mount

Compatibility & Intended Use

The HS510C is designed to mount directly to 1913 Picatinny or Weaver rails, making it compatible with AR-style rifles, patrol carbines, PCCs, and shotguns equipped with a top rail. It is commonly used as a primary carbine optic for range shooting, duty or patrol-style setups, and sporting long-gun applications. The included absolute co-witness mount supports use with standard-height iron sights, and a lower 1/3 co-witness spacer is available separately from the manufacturer.