The Holosun ARO GR2 is a compact enclosed rifle green dot sight with a high-visibility 2 MOA dot in a sealed 22mm housing. Green is perceived as brighter by many shooters, helping the dot pop against varied backgrounds — sealed reliability at an accessible price.
Shake Awake motion activation gives instant-on readiness and up to 50,000 hours of runtime, and it ships with both a lower-1/3 co-witness mount and a low mount.
How It Compares
Prefer red or gold? See the ARO RD2 or GD2. Want selectable reticles? The ARO MRS green. Browse all enclosed red dot sights, build via AR-15 optics, and read green vs red dot sights.
Key Features
- Compact 22mm enclosed emitter; clean 2 MOA green dot
- Shake Awake motion activation
- Lower-1/3 co-witness + low mount included
- Up to 50,000 hours; IP67
- Durable aluminium housing
Technical Specifications
| Reticle |
2 MOA dot (green) |
| Objective |
22 mm (enclosed) |
| Brightness |
8 day / 2 NV |
| Click Value |
1 MOA |
| Battery |
CR2032 (up to 50,000 h) |
| Mount |
Lower-1/3 co-witness + low mount |
| Housing |
Aluminium, IP67 |
What's Included
- Holosun ARO GR2 green dot
- Lower-1/3 mount + low mount, CR2032 battery, lens cloth, manual
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Holosun's warranty.
Frequently Asked Questions
Is it enclosed?
Yes — a sealed 22mm emitter for all-weather reliability.
Green or red?
Many shooters find green appears brighter; otherwise identical to the red ARO RD2.
Does it co-witness?
Yes — it ships with a lower-1/3 co-witness mount and a low mount.
