HOLOSUN HS403R HE403R-GD 2 MOA Dot Micro Sight - Durable 20mm Optic

In this review the HOLOSUN HS403R / HE403R-GD is examined as a compact, practical red dot for rifle and carbine users who want a reliable 1x optic without fuss. The bottom line: it is for shooters who need a tough, efficient micro sight with a crisp 2 MOA dot and long battery life; the rotary intensity switch and multilayer reflective glass are the single biggest reasons to consider it for everyday range use and field carry. The review focuses on real-world usability, mounting options, and optical performance rather than marketing claims.

Key Features

• Micro 20mm window: The compact 20mm diameter window keeps weight and profile low while still offering a clear sight picture for close and mid-range shots.
• 2 MOA reticle: The precise 2 MOA dot gives fine aiming reference for accurate follow-up shots on rifles and carbines.
• Rotary intensity switch: The integrated rotary switch makes brightness changes simple and places the CR2032 battery in an easy-access compartment.
• Durable aluminum housing: Cast aluminum construction and MAO surface finish provide a robust package that tolerates regular handling and mounting changes.
• Multilayer reflective glass: Optical-quality, multi-coated lenses reduce glare and support bright, high-contrast reticle visibility in varied lighting.
• Super LED efficiency: Holosun Super LED technology yields long battery life with multiple color options including the Gold Dot for color-variant users.

Who It's For

The HS403R / HE403R-GD suits shooters who want a low-profile red dot for rifles and carbines, including sport shooters and hunters who prefer a lightweight optic with simple controls and a small footprint. Its parallax-free, unlimited eye relief design makes it useful for quick target acquisition and for users who mount optics for speed rather than magnification.

Those who want integrated solar fail-safe, multi-reticle systems, or magnified optics should look elsewhere; this 1x micro sight is not a magnifier or multi-reticle package and is best paired with iron sights or backup optics for some applications.

Pros & Cons

Pros

• Compact and light 20mm design keeps the rifle balance and profile minimal.
• Excellent battery efficiency from Super LED tech, with long service life on a single CR2032.
• Durable cast aluminum housing with included lower 1/3 co-witness and low mounts for flexible mounting heights.
• Clear, multilayer-coated glass provides strong reticle contrast and reduced glare.

Cons

• Small window size may feel restricted for shooters who prefer larger fields of view.
• Rotary switch controls may be less intuitive for users accustomed to push-button interfaces.

Specifications

Reticle	2 MOA dot
Window Size	20mm diameter
Magnification	1x
Battery Type	CR2032 (rotary compartment)
Battery Life	up to 100,000 hrs (setting 6) / up to 50,000 hrs typical Super LED
Housing	Durable cast aluminum, MAO finish
Adjustments	0.5 MOA per click, 50 MOA W&E travel

Our Verdict

The HOLOSUN HS403R / HE403R-GD is a solid choice for shooters who need a rugged, efficient micro red dot with a precise 2 MOA aiming point and flexible mounting options. It delivers strong optical clarity, long battery life, and durable construction at a practical price, making it good value for users who prioritize a small, reliable 1x sight for rifles and carbines.

Frequently Asked Questions

Is this sight parallax free?
Yes, the sight is designed to be parallax free with unlimited eye relief for quick target acquisition.

What battery does it use and how long does it last?
The HS403R / HE403R-GD uses a CR2032 battery in the rotary compartment and benefits from Super LED efficiency for very long operational life.

Can I mount this for low comb height?
Yes; the package includes a low mount (.75 in) and a lower 1/3 co-witness mount (1.63 in) for different cheek weld preferences.