The HS503R is a 20mm micro optical red dot optic that features Holosun's new rheostat dial to adjust brightness settings, red 2 MOA dot/65 circle size, unlimited eye relief, unlimited field of view and has a IP67 waterproof rating. The HS403R can achieve a constant "on" battery life of up to 100,000 hours. Includes lower 1/3 Co-witness mount, T10 L key, low profile mount, rubber cover, CR2032 battery, lens cloth and user manual.
| Attribute | Value |
| Magnification | 1x |
| Objective | 20mm |
| Field of View | Unlimited |
| Eye Relief | Unlimited |
| Dot Size | 2/65 MOA |
| Length | 2.75" |
| Weight | 3.74 oz |
| Finish | Black Anodized |
| Battery | CR2032 |
| Reticle | Red Circle w/Dot |
| Adjustment Size | .50 MOA |
| Proofs | Impact/Weather Resistant/Waterproof |
| Optic Coating | Multi-Coated |
| Windage Elevation | Adjustable |
| Manufacturer Part Number | HS503R |
