Holosun 503CU Red Dot – 2 MOA Dot / 65 MOA Circle
The 503 is the multi-reticle version of Holosun's 20mm tube sight. Where the 403 gives you a single dot, the 503 adds a 65 MOA circle you can run alone or around the dot — fast at close range, precise when you need it.
Red keeps things simple and efficient. It draws the least current of the three colors, which is part of why the runtime numbers on these sights look the way they do. This configuration adds Holosun's solar panel, which supplements the battery in daylight and keeps the reticle lit if the cell ever dies. The Multi-Reticle System puts a 2 MOA dot, a 65 MOA circle, and the two combined on one switch, so you change the reticle to the shot instead of settling for one compromise.
It shares the 403's compact tube format, long battery life and Shake Awake. Holosun has replaced the 503 line with the ARO series, so this is legacy stock in the classic format.
Specifications
- Reticle: Red 2 MOA dot with 65 MOA circle, selectable
- Magnification: 1x
- Window: 20mm tube
- Battery: CR2032, up to 50,000 hours
- Housing: Aluminum
- Features: Shake Awake
- Part number: HS503CU
Fits: Any Picatinny rail with a micro-optic mount.
Covered by Holosun's limited lifetime warranty on the optic. Ships from WBT Guns, a licensed FFL dealer serving shooters since 2012.
