The Sig Sauer ROMEO4S 1x20 red dot sight brings speed and precision to your rifle setup, whether you're running a defensive carbine, hunting rifle, or competition build. This compact 1x magnification optic centers on a 2 MOA dot reticle paired with a ballistic circle-dot pattern, giving you multiple aiming references for different ranges and engagement speeds. The graphite finish pairs cleanly with modern tactical or hunting aesthetics, and at this size it's equally at home on a short-barreled rifle or mounted forward on a longer setup.
Built to Sig Sauer's military-grade standard, the ROMEO4S uses aircraft-grade CNC aluminum construction that's waterproof and fog-proof, so it'll keep working in rain, snow, or temperature swings. The dual-power system—solar and battery—gives you runtime exceeding 100,000 hours, meaning you could literally leave it on for years without worrying about the battery dying in the field. Elevation and windage adjustments click in 0.5 MOA increments, letting you dial in tight groups at the bench and dial for distance when hunting or shooting long range.
The ROMEO4S ships with both a true co-witness QR mount and a lower-1/3 co-witness option, so you can pick the sight height that works with your rifle's backup iron sights or other accessories. User-selectable reticles give you flexibility to switch between the 2 MOA dot, dot-with-holds, circle-dot, or circle-dot-with-holds depending on your target, light conditions, or personal preference. This is the kind of no-nonsense reliability that appeals to shooters who need their optics to work the first time, every time.
| Magnification | 1x |
| Objective Diameter | 20mm |
| Reticle Options | 2 MOA Dot, Dot with Holds, Circle Dot, Circle Dot with Holds |
| Reticle Size (Primary) | 2 MOA |
| Adjustment | 0.5 MOA per click |
| Power Source | Solar and battery |
| Runtime | 100,000+ hours combined solar and battery |
| Housing Material | Aircraft-grade CNC aluminum |
| Finish | Graphite |
| Waterproofing | Waterproof and fog-proof |
| Mounts Included | True co-witness QR mount and lower-1/3 co-witness mount |
The sight ships with both a true co-witness QR mount and a lower-1/3 co-witness mount, so you can choose the height that best suits your rifle's backup irons or other rail-mounted accessories.
The ROMEO4S delivers over 100,000 hours of runtime using a combination of solar charging and battery power, so you can run it continuously for years without replacing the battery in normal use.
Yes. The ROMEO4S features user-selectable reticles, allowing you to switch between a 2 MOA dot, dot with holds, circle dot, and circle dot with holds to match your shooting situation or preference.
Yes. The sight is fully waterproof and fog-proof, designed to maintain reliability in rain, snow, and temperature extremes encountered in the field.
Sig Sauer
Sig Sauer
Sig Sauer
