OVERVIEW
The HS403R is a 20mm micro sight designed for rifle and carbine applications. HS403R features a Rotary switch to select reticle intensity, Holosun’s Red Super LED with 50k hour battery life, and a 2MOA dot with 10 daylight and 2 night vision compatible reticle intensity settings.
HS403R housing is made from durable cast aluminum and includes both a lower 1/3 co-witness mount (1.63”) and a low mount (.75”) for low-comb height rifle applications. Additional features include rubber lens covers, and a battery compartment integrated into the Rotary switch for the 2032 battery. HS403R is a versatile sight for users of all levels.
Items Dimensions (in inches)

Multilayer Reflective Glass
Holosun’s use of Grade 5 Titanium in certain Elite category optics and laser devices results in unparalleled strength and durability. Holosun Grade 5 Titanium has more than double the tensile strength and has five-times the fatigue strength of 7075 Aluminum. Grade 5 Titanium is also able to withstand the corrosiveness of seawater making Holosun Titanium model optics and lasers suitable for use in maritime environments.
- 2 MOA Dot Reticle
- Up to 100,000 Hours Battery Life (Setting 6)
- 12 Brightness Setting: 10 DL & 2 NV Compatible
- Rotary Battery Compartment
- Parallax-free & Unlimited Eye Relief
OPTICAL SPECS
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Reticle
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2 MOA Dot
|
|
Light Wavelength
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650nm
|
|
Reticle Color
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Red
|
|
Parallax Free
|
Yes
|
|
Unlimited Eye Relief
|
Yes
|
|
Magnification
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1x
|
|
Multi-Coatings
|
Yes
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ELECTRONIC SPECS
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Power Source
|
Battery
|
|
Battery Type
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CR2032
|
|
Battery Life (Hours)
|
100000
|
|
Brightness Setting
|
10 DL&2 NV
|
PHYSICAL SPECS
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Window Size
|
20mm Diameter
|
|
Dimension (in)
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2.75×1.43×1.62
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|
Weight (oz)
|
3.53
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MECHANICAL SPECS
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Housing Material
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Durable Aluminum
|
|
Surface Finish
|
MAO
|
|
Adjustment per Click
|
0.5 MOA
|
|
W&E Travel Range
|
±50 MOA
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ENVIRONMENT SPECS
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Storage Temperature
|
-40℃~70℃
|
|
Working Temperature
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-30℃~60℃
|
|
Submersion
|
IP67
|
|
Vibration
|
1000G
|
In the Box
Lower 1/3 Cowitness Mount
Low Profile Mount
T10 L Key
Rubber Cover
User Manual
CR2032 Battery
Lens Cloth