Holosun Red Dot Sight Dark Earth HS403B

Holosun HS403B Red Dot Sight Dark Earth

At Bullseye Country Sport, we've found that a good red dot sight should do two things exceptionally well: provide a clear aiming point and be ready when you need it. Whether you're setting up a rifle for hunting, practical shooting or range use, reliability matters just as much as optical clarity.

The Holosun HS403B is a compact 20mm red dot sight built around Holosun's highly regarded Red Super LED system. Offering up to 50,000 hours of battery life from a single CR2032 battery, the HS403B provides a crisp 2 MOA aiming point with 10 daylight brightness settings and 2 night vision-compatible settings. The multi-coated lens helps maximise light transmission while reducing glare, resulting in a clear sight picture across a wide range of lighting conditions.

One of the standout features is Holosun's Shake Awake™ technology, which automatically powers down the optic when left stationary and instantly reactivates it when movement is detected. Combined with the side-mounted battery tray, this makes battery changes and day-to-day use straightforward without removing the sight from the rifle. The included low-profile mount and lower 1/3 co-witness mount provide flexibility for different rifle setups and shooting preferences.

Why It's Great

2 MOA Red Super LED reticle

Up to 50,000 hour battery life

Shake Awake™ motion-sensing technology

10 daylight brightness settings

2 night vision-compatible settings

Multi-coated optical glass

Side-mounted CR2032 battery tray

Includes low-profile and lower 1/3 co-witness mounts

Durable 6061-T6 aluminium construction

IP67 waterproof rating

Quick Specs

Manufacturer: Holosun

Model: HS403B

Colour: Dark Earth

Reticle: 2 MOA Red Dot

Objective Lens Diameter: 20mm

Battery Type: CR2032

Battery Life: Up to 50,000 Hours

Brightness Settings: 10 Daylight / 2 Night Vision

Housing Material: 6061-T6 Aluminium

Surface Finish: MAO

Adjustment Per Click: 0.5 MOA

Windage & Elevation Range: ±50 MOA

Waterproof Rating: IP67

Operating Temperature: -30°C to 60°C

Storage Temperature: -40°C to 70°C

Length: 2.45in

Width: 1.43in

Height: 1.6in

Weight: 2.82oz

In The Box

HS403B Red Dot Sight

Lower 1/3 Co-Witness Mount

Low Profile Mount

CR2032 Battery

Rubber Lens Covers

T10 L-Key

Lens Cloth

User Manual

Same Day Dispatch on All Orders Placed Before 3pm Monday – Friday

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