Holosun HS510C FDE Open Reflex Red Dot, MRS

The Holosun HS510C FDE Open Reflex Red Dot Sight is a non-magnified aiming optic designed for rifles, carbines, PCCs, and shotguns that require fast target acquisition and flexible reticle options. Featuring a precise 2 MOA center dot and Holosun’s Multi-Reticle System, the HS510C FDE provides a compact, durable solution for shooters who want speed, clarity, and adaptability on long-gun platforms.

Produced by Holosun, the HS510C FDE combines a rugged aluminum housing with a titanium-alloyed hood to protect the open-reflex window from impact and environmental stress. Its Flat Dark Earth finish offers a subdued, non-reflective appearance that pairs well with modern carbines and duty-style setups.

The HS510C FDE addresses the need for a lightweight, open-reflex optic that supports both rapid engagement and precise aiming. Its Multi-Reticle System allows users to switch between a 2 MOA dot, a 65 MOA circle with dot, or a circle-only reticle to suit different shooting tasks. Dual power operation—using a CR2032 battery supplemented by solar assist—extends runtime and helps maintain operation across varying light conditions. Unlimited eye relief and a parallax-free design make the optic easy to use from unconventional shooting positions.

Key Features

• 2 MOA center dot for precise aiming

• Multi-Reticle System (MRS): dot, circle-dot, or circle-only options

• Solar assist with CR2032 battery backup for extended operation

• Holosun Super LED with long service life and multiple brightness settings

• Night-vision compatible low-intensity settings plus daylight modes

• Aluminum housing with titanium-alloyed hood for impact resistance

• Quick-detach Picatinny/Weaver mount with absolute co-witness height

• Parallax-free optic with unlimited eye relief

• Compact open-reflex design suitable for carbines and shotguns

Specifications & Construction

• Magnification: 1x

• Materials: Aluminum housing with titanium-alloyed hood

• Finish: Flat Dark Earth (matte)

• Dimensions (listed):

  • Length: 4.75 in

  • Width: 3.65 in

  • Height: 3.25 in

• Objective Window: Approx. 0.91″ x 1.26″

• Adjustment Increment: 0.50 MOA per click

• Weight: 9.31 oz

• Power: 1 × CR2032 battery with solar failsafe

• Durability Notes: Listed as impact-resistant, shockproof, waterproof, and weather resistant; includes Shake Awake technology

Compatibility & Intended Use

The HS510C FDE mounts directly to Picatinny/Weaver (1913) rail systems using its integrated quick-detach mount. Typical applications include AR-pattern carbines, patrol rifles, PCCs, and shotguns where a low-profile, open-reflex sight is preferred. It is commonly used as a primary optic and supports absolute co-witness with compatible backup iron sights.

Supporting search terms include Holosun HS510C FDE, open reflex red dot sight, non-magnified rifle optic, Picatinny red dot, and carbine reflex sight. This description clearly outlines construction, features, and intended use so buyers can quickly determine if the HS510C FDE fits their platform and shooting requirements.