The HS503CU is a 20mm micro sight designed for rifle and carbine applications. HS503CU features Holosun’s Solar Failsafe technology and our Multi-Reticle System (MRS) which includes a 2MOA dot and a 65 MOA Circle. Holosun’s Red Super LED allows for up to 50k hour battery life with 10 daylight and 2 night vision compatible reticle intensity settings.

The HS503CU housing is made from 6061 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 Shake Awake technology, rubber lens covers, and a side battery for the 2032 battery. HS503CU is a versatile sight for users of all levels.

Key Features: 

  • Solar Failsafe™ & Shake Awake™
  • Multiple Reticle System (MRS)
  • MRS:2 MOA Dot; 2 MOA Dot & 65 MOA Circle
  • Super LED
  • Multilayer Reflective Glass
  • 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

Comes with: 

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


Reticle 2 MOA Dot & 65 MOA Circle

Light Wavelength 650nm

Reticle Color Red

Parallax Free Yes

Unlim. Eye Relief  Yes

Magnification 1x

Multi-Coatings Yes


Power Source  Solar & Battery

Battery Type CR2032

Battery Life (Hrs) 50000

Brightness Setting  10 DL&2 NV


Window Size 20mm Diameter

Dimension (in) 2.6×1.43×1.6

Weight (oz) 3


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

Brand Holosun Optics

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