Holosun HS403B Micro Red Dot Sight


The HS403B is a 20mm micro optical sight designed for rifle and carbine applications. Features include 12 brightness settings - 10 DL & 2 NV Compatible, Holosun’s Super LED with up to 50k hours battery life (Setting 6), and 2 MOA Dot. Convenient tray battery compartment. Parallax-free & unlimited eye relief.

The 403B is a small compact micro red dot optic. Employing Holosun’s LED technology, the lifetime for one CR2032 battery can be up to 5 years. This optic features our “Shake Awake” technology that powers the optic on with slight movement of the 403B. It may be installed on various firearms such as shotguns, pistols, air rifles and crossbows. The HS403B is compatible with standard mounts.


- Lower 1/3 Cowitness Mount
- Low Profile Mount
- T10 L Key
- Rubber Cover
- User Manual
- CR2032 Battery
- Lens Cloth


+ Super LED with up to 50k hours battery life +

Holosun Super LEDs provide a versatile range of intensity for the brightest environments down to no-light situations.

Not only does the Super Green LED give the user an option for those who have difficulty seeing in the red colour spectrum, but it also gives greater power efficiency when using the optic in high brightness settings...


+ Shake Awake +

Holosun’s Shake Awake Technology shuts the LED off during periods of motionlessness. The amount of time it takes for the LED to deactivate (enter Sleep Mode) is user programmable. Shake Awake can also be completely deactivated which keeps the optic powered on for up to 100k hours (certain models). 

More Information

Light Source: LED
Reticle: 2MOA Dot
Parallax Free: Yes
Unlimited Eye Relief: Yes
Magnification: 1x
Multi-Coatings: Yes
Integrated Laser: No

Battery Type: CR2032
Battery Life: Up to 50,000 Hours
Brightness Setting: 10 Daylight & 2 NV Compatible

Housing Material: 6061 Aluminum
Surface Finish: MAO
Housing Color: Black
Adjustment per Click: 0.5 MOA
W&E Travel Range: ±50 MOA
Storage Temperature: -40℉ - 158℉
Working Temperature: -22℉ - 140℉
Submersion: IP67
Vibration: Up to 1000G

Window Size: 20mm Diameter
Dimension (in): 2.44 x 1.18 x 1.45
Weight (oz): 4.3
Central Height (in): 1.63

Holosun HS403B Micro Red Dot Sight