Sig Sauer® ROMEO4S 1x20mm 2 MOA Ballistic Circle Dot Reticle Red Dot Sight


Solar powered red dot sight with 100,000+ hour battery life.  Switch between 4 varying details of reticles comprised of a 2 MOA Centre Red dot and ballistic drop points enclosed in a 65 MOA circle.


  • Designed for modern semi-automatic pistols, MSR platforms and shotguns
  • Short and medium range engagements and recreational shooting across a wide range of calibers and light conditions
  • Extremely strong and light CNC aluminum housing
  • Runtime in excess of 100,000 hours with solar and battery usage
  • Comes standard with see-through lens covers and quick-release mount
  • Ballistic Circle-Dot and Ballistic Circle QuadPex reticle options
  • Users can select from 4 different integrated reticle options (Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds)
  • Unlimited eye relief to acquire aiming point and target, regardless of eye position behind sight.
  • MOTAC (Motion Activated Illumination) powers up or down when sensing motion
  • Uses an ultra-efficient red LED illumination for daylight visibility and extended runtime
  • True co-witness QR mount and low mount included
  • Strong, lightweight aircraft-grade CNC aluminum housing
  • Waterproof, IPX-7 rated, and fog-proof.


Reticle Related:

Reticle 2 MOA Red Dot Ballistic Circle Dot Reticle Colour Red
Center Dot Size (MOA) 2 Circle Size (MOA) 65 MOA
Battery (1) CR2032 Run Time (hrs) 100000
Illumination Settings 10 Daytime/2 NV

Adjustment Settings:

Magnification 1x Objective Lens Diameter (mm) 20
Adjusment Increments (MOA) 0.5 Total Elevation Travel (MOA) 100
Total Windage Travel (MOA) 100


Mount Modular QR Picatinny Mount (Low and 1.4″) Overall Length (mm) 85.5
Overall Width (mm) 46 Height (mm) 63.5
Weight (oz) 7.6 Waterproofing IPX 7
Color Graphite

Additional Information:

Infinite Guarantee

SIG SAUER Electro-Optics are guaranteed forever. It’s an unlimited lifetime guarantee.


Activated through motion sensing technology, MOTAC immediately powers up illumination when it senses motion and powers down when it does not in order to extend battery life.


Highly efficient, ultra-wide broadband, anti-reflection lens coatings reduce surface reflections to extremely low levels across the entire visible spectrum providing superior light transmission.

Stealth ID™

Electro-Optics industrial design inspired by our legendary firearms; deflection armor trapezoidal surfacing breaks up the shape and visibility of the optic along with pistol slide serrations and grip checkering to add function to the form of all SIG SAUER electro-optics.

5 Year Warranty

(Electronic Component Limited 5 Year Warranty) Covers any defects in materials and workmanship in the electronic and Tritium components of illuminated riflescopes/sights, pistol sights, electronic sights, flashlights, lasers, binoculars, spotting scopes and rangefinders for five years from date of manufacture.


Manufacturers, importers, suppliers, and distributors may make changes to their products without fanfare. Such changes can lead to discrepancies between the advertised product and the actual product in inventory. While International Shooting Supplies Ltd. endeavors to correctly describe the actual product in inventory, we will not be responsible for unintentional inaccuracies in text and images of the advertised product.




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Please note: International Shooting Supplies does not ship to addresses outside Canada.