The Holosun SCS 320 Green Dot Sight (SCS-320-GR) is a 1x enclosed pistol green dot sight that direct-mounts to SIG Sauer P320 optics-ready slides with no adapter plate, powered by an internal rechargeable cell charged by ambient light. It carries the Multi-Reticle System — a 2 MOA green dot, a 32 MOA circle, or both together as a circle-dot.
The Solar Charging Sight system removes the battery tray entirely: the internal rechargeable cell is topped up by light, so there is no cell to source and no replacement interval to track. Brightness is fully automatic, so nothing needs setting before a string of fire, and the enclosed emitter sits behind a sealed window that keeps dust and rain off the LED.
How It Compares
The same solar-charging optic is cut for other slides: SCS MOS for Glock MOS, SCS PDP for the Walther PDP, SCS VP9 for the H&K VP9, SCS MP2 for the S&W M&P 2.0 and SCS P10 for the CZ P-10. For a slimline pistol on the RMSc footprint, see the SCS Carry green dot sight. Browse all enclosed red dot sights and the full Holosun green dot sight range.
Ideal For
- SIG Sauer P320 optics-ready pistols, including Section 1 long-barrelled conversions
- Airsoft GBB P320 and M17/M18 replica builds
- Shooters who never want to source or fit another optic battery
- Wet-weather range and outdoor use, where a sealed emitter stays clear
Key Features
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Reticle: green Multi-Reticle System — 2 MOA dot, 32 MOA circle, or circle-dot
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Power: Solar Charging Sight system — internal rechargeable cell, no removable battery
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Mount: direct mount to SIG P320 optics-ready slides, no adapter plate
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Emitter: fully enclosed, sealed against dust, lint and rain
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Illumination: automatic brightness adjustment only, no buttons to set
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Adjustment: 1 MOA per click, parallax-free
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Housing: aluminium
Technical Specifications
| Optic Type |
Enclosed pistol green dot sight, 1x (non-magnified) |
| Reticle |
Multi-Reticle System — 2 MOA dot / 32 MOA circle / circle-dot |
| Reticle Colour |
Green |
| Magnification |
1x, parallax-free |
| Mounting System |
Direct mount to SIG Sauer P320 optics-ready slides |
| Battery |
Internal rechargeable cell, solar charging — no removable battery |
| Illumination |
Automatic brightness adjustment only |
| Click Value |
1 MOA per click |
| Housing |
Aluminium |
| MPN |
SCS-320-GR |
What's Included
- Holosun SCS-320-GR enclosed green dot sight
- Mounting hardware, lens cloth and user manual
Warranty
Covered by Holosun's manufacturer warranty, handled in the UK by Xtreme Tactical.
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
What pistols does the Holosun SCS 320 fit?
The Holosun SCS 320 Green Dot Sight direct-mounts to SIG Sauer P320 optics-ready slides with no adapter plate required. It is cut for that slide pattern specifically, so it is not an RMR- or RMSc-footprint optic and will not fit other slides.
Does the Holosun SCS 320 ever need a battery change?
No. The Holosun SCS 320 uses an internal rechargeable cell charged by ambient light, so there is no removable battery and no tray to open.
Can I set the brightness on the Holosun SCS 320?
No. Brightness on the Holosun SCS 320 is fully automatic with no manual settings, which is why there are no buttons on the housing.
What reticle options does the Holosun SCS 320 have?
The Holosun SCS 320 uses the Multi-Reticle System, which switches between a 2 MOA green dot on its own, a 32 MOA circle on its own, and both together as a circle-dot.
Why choose an enclosed emitter over an open one?
The sealed window on the Holosun SCS 320 keeps rain, dust and lint away from the emitter. On an open-emitter optic those can settle in front of the LED and dim or block the dot, which matters on a British range in winter.
