Holosun HE510C-GR Elite Open Reflex Sight, Green MRS

Holosun HE510C-GR Open Reflex Sight is an open-frame, non-magnified reflex optic designed to provide a fast, clearly visible green reticle for rifles and carbines. Built around Holosun’s Multiple Reticle System and dual-power operation, this optic delivers a reliable 1x aiming solution for close to intermediate engagement distances.

The HE510C-GR is intended for long-gun platforms where rapid target acquisition and an unobstructed field of view are priorities. Its open reflex design and large lens window allow shooters to track targets efficiently while maintaining situational awareness. The selectable green reticle options can be especially beneficial for shooters who prefer higher contrast than traditional red dots or who experience visual strain with single-dot optics.

Key Features

• Open-frame reflex sight optimized for rifle and carbine use

• Multiple Reticle System (MRS) with selectable options:

  • 2 MOA green center dot

  • 65 MOA circle with 2 MOA dot

  • 65 MOA circle only

• Large open lens window measuring approximately 32 mm x 24 mm

• Dual-power system with integrated solar cell and internal coin-cell battery

• Shake Awake technology activates illumination with motion to conserve power

• Titanium-alloyed protective hood for added impact resistance

• 1x magnification with unlimited eye relief

• Windage and elevation adjustments in 0.50 MOA increments

• Quick-release Picatinny-compatible mount included

Specifications & Construction

The HE510C-GR combines an aluminum main housing with a titanium-alloyed protective hood to safeguard the optic’s electronics and lens. The exterior is finished in black anodizing for durability and corrosion resistance. Overall external dimensions are approximately 3.30 x 3.70 x 4.75 inches, with a reported overall length of about 3.3 inches. The optic uses multi-coated lenses and is described as waterproof for use in adverse weather conditions.

Compatibility & Intended Use

This reflex sight mounts directly to firearms equipped with a 1913 Picatinny rail using the included quick-release mount. It is commonly used on carbines, patrol rifles, pistol-caliber carbines (PCCs), and shotguns as a primary non-magnified optic. The included mount supports absolute co-witness with standard AR-height iron sights, and optional spacers can be used for lower 1/3 co-witness configurations if desired.

What’s Included

• Holosun HE510C-GR open reflex sight

• Quick-release Picatinny mount

• Internal battery (as supplied by manufacturer)

• Adjustment tool

• User documentation