Holosun Red Dot HS403B

Product Description

Holosun Red Dot HS403B

The HS403B is a 20mm micro optical sight designed for rifle and carbine applications. Features include 12 brightness settings, Holosun’s Super LED with up to 50K hour battery life, and 2 MOA Dot.   Includes lower 1/3 co-witness and low profile mounts. 


  •  2 MOA Dot Reticle
  • Up to 50,000 Hours Battery Life (Setting 6)
  • 12 Brightness Setting: 10 DL & 2 NV Compatible
  • Convenient Tray Battery Compartment
  • Parallax-free & Unlimited Eye Relief



  • Reticle                                    2 MOA Dot 
  • Light Wavelength                 650nm
  • Reticle Color                         Red
  • Parallax Free                        Yes
  • Unlimited Eye Relief            Yes
  • Magnification                       1x
  • Multi-Coatings                     Yes


  • Power Source                      Battery
  • Battery Type                        CR2032
  • Battery Life (Hours)           50 000
  • Brightness Setting             10 DL&2 NV


  • Window Size                        20mm Diameter
  • Dimension (in)                    2.45×1.43×1.6
  • Weight (oz)                          2.82


  • Housing Material                6061 T6 Aluminum
  • Surface Finish                     MAO
  • Adjustment per Click         0.5 MOA
  • W&E Travel Range             ±50 MOA


  • Storage Temperature        -40~70
  • Working Temperature       -30~60
  • Submersion                         IP67
  • Vibration                              1000G


    Since Holosun's inception in 2013, its main goal has always been to bring cutting edge technology to the end user. They continuously strive to improve and innovate our products by producing technology that makes sense and works! Below you will find more information on the technology that has made Holosun stand out from the crowd.

    See Holosun's Innovations here https://holosun.com/index/category/items/id/101.html

    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).

    Multiple Reticle System (M.R.S.)
    M.R.S. gives the user the flexibility to use their optic as they need it. Units with this feature allow the user to turn on or off certain sections of the reticle giving the ability to have the ideal reticle for the job at hand. If you need a precise shot, you can run the 2MOA dot only. You need a reticle for fast target acquisition, just turn on an additional 65MOA ring with the push of a button! The best part....no need to rezero your optic when switching between reticle options!

    Super LED
    Holosun has been a leader in laser and LED technology for many years. Holosun Super LEDs provide a versatile range of intensity for the brightest environments down to no-light situations.
    High luminous efficiency, the human eye is more sensitive and comfortable to gold and green(high visual function).
    Not only does the Super Green LED give the user an option for those who have difficulty seeing in the red color spectrum, but it also gives greater power efficiency when using the optic in high brightness settings...

    Multilayer Coatings

    Holosun red dot sights and magnifiers are manufactured using optical glass with multilayer coatings applied to facilitate maximum light transmission and wear resistance while reducing glare.
    Little Phase Difference
    High Reflectivity

    Vendor: HOLOSUN
    Maximum quantity available reached.

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