Holosun HS403B Micro Red Dot Optic (2 MOA)

MSRP: $211.75
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Holosun HS403B Red Dot Sight - 2 MOA dot with 65 MOA Circle

Lightweight, compact, proven, economical

Features integrated mount to achieve 1/3 lower co-witness sighting.  The HS403B has a 20 mm lens designed for rifled and AR pistol applications, but can easily be adapted for air guns, shotguns and crossbows.  The 403B is a small, compact micro red dot optic. Employing Holosun’s LED technology, the CR2032 battery can last for 5 years. The “Shake Awake” technology powers on the sight with slight movement.  The HS403B is compatible with standard mounts, in addition to the 1/3 lower co-witness mount that comes standard.


  • COMPACT DESIGN: Holsun's HS403B is a 20mm micro optical sight designed for rifles and carbine applications.
  • LONG BATTERY LIFE: The Holosun 403-B provides up to 50,000 hours at mid-level (6) setting.  
  • LITHIUM ION BATTERY:  CR2032 for common replacement
  • SHAKE AWAKE: Holosun’s Shake Awake Technology shuts the LED off during periods of inaction; at the slightest movement, the on-board motion sensor instantly activates the LED.
  • MULTI-COATED LENS: Holosun’s optics are manufactured using optical glass with multilayer coatings applied to facilitate maximum light transmission and wear resistance while reducing glare.
  • DESIGNED FOR DAYLIGHT AND NIGHT VISION:  Holosun's Super LEDs provide a versatile range of intensity for the brightest environments down to no-light situations.
  • 2 MOA DOT
  • PARALLAX FREE eye relief
  • TRUE 1X red dot


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)     2.45 x 1.43 x 1.60
Weight (oz)     2.82
Manufacturer's Part No.     HS403B

See Review of the Holosun 403B in RedDot Sight Reviews

Included in Package:

  • HS403B Optic
  • Lower 1/3 Mount
  • Rubber Cover
  • CR2032 Battery
  • Lens Cloth
  • Hey key tool
  • User Manual