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SIG Sauer ROMEO4 Red Dot Sights

SIG Sauer ROMEO4 Red Dot Sights are premium, battle-proven optics designed for tactical professionals, law enforcement, and competitive shooters who require fast target acquisition, durability, and advanced reticle options. Engineered for rifles, carbines, and shotguns, the ROMEO4 series delivers unmatched reliability and performance in any environment.

Key Features:

  • 2 MOA Red Dot with Multiple Reticle Options – Choose from single dot, circle-dot, crosshair, or circle-dot-crosshair reticles for customizable aiming solutions.
  • Motion Activated Illumination (MOTAC™) – Automatically powers on when motion is detected and turns off when idle, extending battery life.
  • Ultra-Long Battery Life – Operates for 50,000+ hours on a single CR2032 battery, with Solar Failsafe™ backup on select models.
  • Parallax-Free & Unlimited Eye Relief – Ensures rapid, instinctive aiming with both-eyes-open shooting.
  • Durable Waterproof & Fog-Proof DesignIPX-7 rated, capable of withstanding harsh conditions and full water submersion.
  • Quick-Detach Mounting – Includes co-witness and lower 1/3 co-witness riser mounts for flexible firearm compatibility.

The SIG Sauer ROMEO4 series is a top-tier red dot sight, offering rugged reliability, cutting-edge technology, and rapid target engagement, making it a trusted optic for military, law enforcement, and serious shooters.

10 products

  • SIG Sauer ROMEO4XT-PRO Red Dot Sight 2 MOA Ballistic Circle Dot Reticle Black - SOR44001 Red Dot Sight SIG Sauer SIG Sauer ROMEO4XT-PRO Red Dot Sight 2 MOA Ballistic Circle Dot Reticle Black - SOR44001 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4XT-PRO Red Dot Sight 2 MOA Ballistic Circle Dot Reticle Black - SOR44001

    4 in stock

    The SIG Sauer ROMEO4XT-PRO Red Dot Sight offers the same high-end optical performance, quad-reticle, and legendary durability of the original ROMEO4T while adding key features requested by professionals.  Illumination control moves to the top, providing easy access with either hand while staying clear of chest rigs and plate carriers when slung. A dedicated night vision override switch makes short work of drastic changes in lighting conditions and by combining MOTAC with a common AAA battery, the ROMEO4XT-PRO is rated for 50,000 hours of runtime.  Like its predecessor, the ROMEO4XT-PRO is IPX8-rated for waterproof and fog proof performance and is tested to MIL-STD-810 to ensure reliable service. SPECIFICATIONS: SIG Sauer ROMEO4XT-PRO Red Dot Sight MAGNIFICATION: 1x OBJECTIVE LENS DIAMETER (MM): 20mm ADJUSTMENT INCREMENTS: 0.5 MOA TOTAL ELEVATION TRAVEL: 100 MOA TOTAL WINDAGE TRAVEL: 100 MOA OVERALL LENGTH: 77mm OVERALL WIDTH: 63mm HEIGHT: 56mm WEIGHT: 7.4oz RETICLE: Ballistic Circle Dot RETICLE COLOR: Red CENTER DOT SIZE: 2 MOA WATERPROOFING: IPX-8 BATTERY: 1x AAA RUN TIME: 50000 hours ILLUMINATION SETTINGS: 9 Daytime - 3 NV MOUNT TYPE: Half Inch Hex Mount COLOR: Black MPN: SOR44001 UPC: 798681671397

    4 in stock

    £649.99

  • SIG Sauer ROMEO4T-PRO Red Dot Sight 2 MOA Quad Ballistic Circle Dot Reticle Black - SOR44101 Red Dot Sight SIG Sauer SIG Sauer ROMEO4T-PRO Red Dot Sight 2 MOA Quad Ballistic Circle Dot Reticle Black - SOR44101 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4T-PRO Red Dot Sight 2 MOA Quad Ballistic Circle Dot Reticle Black - SOR44101

    Out of stock

    SIG Sauer ROMEO4T-PRO Red Dot Sight - 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. Designed, built and tested for hard, professional use Engineered lens coatings for elite performance in bright light or NV Top mounted activation with NV Override control Quad Ballistic Circle Dot Durable half-inch hex mount 9 Daytime settings, 3 NV settings 3 mounting heights come standard in the box Includes clear flip-backs, opaque front flip back, and ARD Kill-Flash 50,000 hr runtime with CR2032 Battery and MOTAC Assembled in USA SPECIFICATIONS: SIG Sauer ROMEO4T-PRO Red Dot Sight MAGNIFICATION: 1x OBJECTIVE LENS DIAMETER (MM): 20mm ADJUSTMENT INCREMENTS: 0.5 MOA TOTAL ELEVATION TRAVEL: 100 MOA TOTAL WINDAGE TRAVEL: 100 MOA OVERALL LENGTH: 67.5 mm OVERALL WIDTH: 50mm HEIGHT: 62.5mm WEIGHT: 6.3oz RETICLE: Quad Ballistic Circle Dot RETICLE COLOR: Red CENTER DOT SIZE: 2 MOA WATERPROOFING: IPX-8 BATTERY: CR2032 RUN TIME: 50000 hours ILLUMINATION SETTINGS: 9 Daytime - 3 NV MOUNT TYPE: Half Inch Hex Mount COLOR: Black SKU: SOR44101 UPC: 798681671397

    Out of stock

    £649.99

  • SIG Sauer ROMEO4S Red Dot Sight 2 MOA Ballistic Circle Dot Reticle - SOR43021 Red Dot Sight SIG Sauer SIG Sauer ROMEO4S Red Dot Sight 2 MOA Ballistic Circle Dot Reticle - SOR43021 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4S Red Dot Sight 2 MOA Ballistic Circle Dot Reticle - SOR43021

    1 review

    14 in stock

    SIG Sauer ROMEO4S Red Dot Sight - Chosen by elite government and military agencies, the ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Regardless of lighting conditions, weather conditions, or terrain. Whether it's a moving target, dangerous game at full charge, or a fast-breaking tactical situation at close quarters, the rugged ROMEO4 red-dot sight can handle the job. Features: SIG Sauer ROMEO4S Red Dot Sight Designed for modern semi-automatic pistols, MSR platforms and shotguns Operators can select from 4 different reticle options 100,000 Hours battery life with solar and battery usage Includes lens caps, a co-witness quick-release mount and a low mount Unlimited eye relief to acquire aiming point and target regardless of eye position behind the sight MOTAC powers up or down when sensing motion Utilizes an ultra-efficient red LED illumination Strong and lightweight aluminum housing Waterproof and fog proof SPECIFICATIONS: Finish: Graphite Waterproof: Yes Length: 3.3 Inches Style: Tube Weight: 2.46 Ounce Width: 1.83 Inches Battery: CR2032 Magnification: 1x Warranty: Sig Sauer Electro Optics Infinite Guarantee Reticle: 2 MOA Ballistic Circle Dot Battery Type: CR2032 Batteries Included: Yes Objective Lens Diameter: 20 Millimeter Eye Relief: Unlimited Maximum Windage Adjustment: 100 MOA Maximum Elevation Adjustment: 50 MOA Reticle Color: Red Housing Material: Aluminum SKU: SOR43021 UPC: 798681567867

    14 in stock

    £439.99

  • SIG Sauer ROMEO4T Red Dot Sight 2 MOA Ballistic Circle Dot Reticle FDE - SOR43131 Red Dot Sight SIG Sauer SIG Sauer ROMEO4T Red Dot Sight 2 MOA Ballistic Circle Dot Reticle FDE - SOR43131 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4T Red Dot Sight 2 MOA Ballistic Circle Dot Reticle FDE - SOR43131

    6 in stock

    SIG Sauer ROMEO4T Red Dot Sight - Chosen by elite government and military agencies, the ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Regardless of lighting conditions, weather conditions, or terrain. Whether it's a moving target, dangerous game at full charge, or a fast-breaking tactical situation at close quarters, the rugged ROMEO4 red-dot sight can handle the job. Features: SIG Sauer ROMEO4T Red Dot Sight Designed for modern semi-automatic pistols, MSR platforms and shotguns Operators can select from 4 different reticle options 100,000 Hours battery life with solar and battery usage Includes lens caps, a 1.41" riser mount with additional lower 1/3 co-witness spacer Unlimited eye relief to acquire aiming point and target regardless of eye position behind the sight MOTAC powers up or down when sensing motion Utilizes an ultra-efficient red LED illumination Strong and lightweight aluminum housing Waterproof and fog proof SPECIFICATIONS: Finish: Flat Dark Earth Waterproof: Yes Length: 3.3 Inches Style: Tube Weight: 3.2 Ounce Width: 1.86 Inches Battery: CR2032 Magnification: 1x Adjustment Click Value: 1/2 MOA Warranty: Sig Sauer Electro Optics Infinite Guarantee Battery Type: CR2032 Batteries Included: Yes Objective Lens Diameter: 20 Millimeter Eye Relief: Unlimited Maximum Windage Adjustment: 100 MOA Maximum Elevation Adjustment: 50 MOA Reticle Color: Red Housing Material: Aluminum SKU: SOR43131 UPC: 798681585939

    6 in stock

    £649.99

  • SIG Sauer ROMEO4T-PRO Red Dot Sight 2 MOA Quad Ballistic Circle Dot Reticle FDE - SOR44102 Red Dot Sight SIG Sauer SIG Sauer ROMEO4T-PRO Red Dot Sight 2 MOA Quad Ballistic Circle Dot Reticle FDE - SOR44102 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4T-PRO Red Dot Sight 2 MOA Quad Ballistic Circle Dot Reticle FDE - SOR44102

    Out of stock

    SIG Sauer ROMEO4T-PRO Red Dot Sight - 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. Designed, built and tested for hard, professional use Engineered lens coatings for elite performance in bright light or NV Top mounted activation with NV Override control Quad Ballistic Circle Dot Durable half-inch hex mount 9 Daytime settings, 3 NV settings 3 mounting heights come standard in the box Includes clear flip-backs, opaque front flip back, and ARD Kill-Flash 50,000 hr runtime with CR2032 Battery and MOTAC Assembled in USA SPECIFICATIONS: SIG Sauer ROMEO4T-PRO Red Dot Sight MAGNIFICATION: 1x OBJECTIVE LENS DIAMETER (MM): 20mm ADJUSTMENT INCREMENTS: 0.5 MOA TOTAL ELEVATION TRAVEL: 100 MOA TOTAL WINDAGE TRAVEL: 100 MOA OVERALL LENGTH: 67.5 mm OVERALL WIDTH: 50mm HEIGHT: 62.5mm WEIGHT: 6.3oz RETICLE: Quad Ballistic Circle Dot RETICLE COLOR: Red CENTER DOT SIZE: 2 MOA WATERPROOFING: IPX-8 BATTERY: CR2032 RUN TIME: 50000 hours ILLUMINATION SETTINGS: 9 Daytime - 3 NV MOUNT TYPE: Half Inch Hex Mount COLOR: FDE SKU: SOR44102 UPC: 798681671403

    Out of stock

    £649.99

  • SIG Sauer ROMEO4T Red Dot Sight 2 MOA Ballistic Circle Dot Reticle Black - SOR43031 Red Dot Sight SIG Sauer SIG Sauer ROMEO4T Red Dot Sight 2 MOA Ballistic Circle Dot Reticle Black - SOR43031 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4T Red Dot Sight 2 MOA Ballistic Circle Dot Reticle Black - SOR43031

    10 in stock

    SIG Sauer ROMEO4T Red Dot Sight -  Chosen by elite government and military agencies, the ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Regardless of lighting conditions, weather conditions, or terrain. Whether it's a moving target, dangerous game at full charge, or a fast-breaking tactical situation at close quarters, the rugged ROMEO4 red-dot sight can handle the job. Features: SIG Sauer ROMEO4T Red Dot Sight Designed for modern semi-automatic pistols, MSR platforms and shotguns Operators can select from 4 different reticle options 100,000 Hours battery life with solar and battery usage Includes lens caps, a 1.41" riser mount with additional lower 1/3 co-witness spacer Unlimited eye relief to acquire aiming point and target regardless of eye position behind the sight MOTAC powers up or down when sensing motion Utilizes an ultra-efficient red LED illumination Strong and lightweight aluminum housing Waterproof and fog proof SPECIFICATIONS: Finish: Black Waterproof: Yes Length: 3.3 Inches Style: Tube Weight: 3.2 Ounce Width: 1.86 Inches Battery: CR2032 Magnification: 1x Adjustment Click Value: 1/2 MOA Warranty: Sig Sauer Electro Optics Infinite Guarantee Battery Type: CR2032 Batteries Included: Yes Objective Lens Diameter: 20 Millimeter Eye Relief: Unlimited Maximum Windage Adjustment: 100 MOA Maximum Elevation Adjustment: 50 MOA Reticle Color: Red Housing Material: Aluminum SKU: SOR43031 UPC: 798681567881

    10 in stock

    £529.99

  • SIG Sauer ROMEO4H Red Dot Sight 2 MOA Ballistic Circle Dot Reticle - SOR43011 Red Dot Sight SIG Sauer SIG Sauer ROMEO4H Red Dot Sight 2 MOA Ballistic Circle Dot Reticle - SOR43011 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4H Red Dot Sight 2 MOA Ballistic Circle Dot Reticle - SOR43011

    10 in stock

    SIG Sauer ROMEO4H Red Dot Sight - Chosen by elite government and military agencies, the ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Regardless of lighting conditions, weather conditions, or terrain. Whether it's a moving target, dangerous game at full charge, or a fast-breaking tactical situation at close quarters, the rugged ROMEO4 red-dot sight can handle the job. Features: SIG Sauer ROMEO4H Red Dot Sight Designed for AR platform pistols, MSR platforms and shotguns Operators can select from different reticle options 50,000+ Hours battery life Includes lens caps, a co-witness quick-release mount and a low mount Unlimited eye relief to acquire aiming point and target regardless of eye position behind the sight MOTAC powers up or down when sensing motion Utilizes an ultra-efficient LED illumination Strong and lightweight aluminum housing Waterproof and fog proof SPECIFICATIONS: Finish: Graphite Waterproof: Yes Length: 3.3 Inches Style: Tube Weight: 3.4 Ounce Width: 1.86 Inches Battery: CR2032 Magnification: 1x Adjustment Click Value: 1/2 MOA Warranty: Sig Sauer Electro Optics Infinite Guarantee Battery Type: CR2032 Batteries Included: Yes Objective Lens Diameter: 20 Millimeter Eye Relief: Unlimited Maximum Windage Adjustment: 100 MOA Maximum Elevation Adjustment: 50 MOA Housing Material: Aluminum SKU: SOR43011 UPC: 798681567843

    10 in stock

    £469.99

  • SIG Sauer ROMEO4S Red Dot Sight 1 MOA Ballistic Circle Plex Reticle - SOR43022 Red Dot Sight SIG Sauer SIG Sauer ROMEO4S Red Dot Sight 1 MOA Ballistic Circle Plex Reticle - SOR43022 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4S Red Dot Sight 1 MOA Ballistic Circle Plex Reticle - SOR43022

    10 in stock

    SIG Sauer ROMEO4S Red Dot Sight - Chosen by elite government and military agencies, the ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Regardless of lighting conditions, weather conditions, or terrain. Whether it's a moving target, dangerous game at full charge, or a fast-breaking tactical situation at close quarters, the rugged ROMEO4 red-dot sight can handle the job. Features: SIG Sauer ROMEO4S Red Dot Sight Designed for modern semi-automatic pistols, MSR platforms and shotguns Operators can select from 4 different reticle options 100,000 Hours battery life with solar and battery usage Includes lens caps, a co-witness quick-release mount and a low mount Unlimited eye relief to acquire aiming point and target regardless of eye position behind the sight MOTAC powers up or down when sensing motion Utilizes an ultra-efficient red LED illumination Strong and lightweight aluminum housing Waterproof and fog proof SPECIFICATIONS: Finish: Graphite Waterproof: Yes Length: 3.3 Inches Style: Tube Weight: 2.46 Ounce Width: 1.83 Inches Battery: CR2032 Magnification: 1x Warranty: Sig Sauer Electro Optics Infinite Guarantee Reticle: 1 MOA Ballistic Circle Plex Battery Type: CR2032 Batteries Included: Yes Objective Lens Diameter: 20 Millimeter Eye Relief: Unlimited Maximum Windage Adjustment: 100 MOA Maximum Elevation Adjustment: 50 MOA Reticle Color: Red Housing Material: Aluminum SKU: SOR43022 UPC: 798681567867

    10 in stock

    £439.99

  • SIG Sauer ROMEO4H Green Dot Sight Horseshoe Dot Reticle - SOR43013 Green Dot Sight SIG Sauer SIG Sauer ROMEO4H Green Dot Sight Horseshoe Dot Reticle - SOR43013 Green Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4H Green Dot Sight Horseshoe Dot Reticle - SOR43013

    10 in stock

    SIG Sauer ROMEO4H Red Dot Sight - Chosen by elite government and military agencies, the ROMEO4 is the ultimate red-dot sight when fast, accurate target acquisition is a must. Regardless of lighting conditions, weather conditions, or terrain. Whether it's a moving target, dangerous game at full charge, or a fast-breaking tactical situation at close quarters, the rugged ROMEO4 red-dot sight can handle the job. Features: SIG Sauer ROMEO4H Red Dot Sight Designed for AR platform pistols, MSR platforms and shotguns Operators can select from different reticle options 50,000+ Hours battery life Includes lens caps, a co-witness quick-release mount and a low mount Unlimited eye relief to acquire aiming point and target regardless of eye position behind the sight MOTAC powers up or down when sensing motion Utilizes an ultra-efficient LED illumination Strong and lightweight aluminum housing Waterproof and fog proof SPECIFICATIONS: Finish: Graphite Waterproof: Yes Length: 3.3 Inches Style: Tube Weight: 3.4 Ounce Width: 1.86 Inches Battery: CR2032 Magnification: 1x Adjustment Click Value: 1/2 MOA Warranty: Sig Sauer Electro Optics Infinite Guarantee Battery Type: CR2032 Batteries Included: Yes Objective Lens Diameter: 20 Millimeter Eye Relief: Unlimited Maximum Windage Adjustment: 100 MOA Maximum Elevation Adjustment: 50 MOA Housing Material: Aluminum SKU: SOR43011 UPC: 798681567843

    10 in stock

    £469.99

  • SIG Sauer ROMEO4XT-PRO Red Dot Sight FDE - SOR44002 Red Dot Sight SIG Sauer SIG Sauer ROMEO4XT-PRO Red Dot Sight FDE - SOR44002 Red Dot Sight SIG Sauer

    SIG Sauer SIG Sauer ROMEO4XT-PRO Red Dot Sight FDE - SOR44002

    8 in stock

    The SIG Sauer ROMEO4XT-PRO Red Dot Sight offers the same high-end optical performance, quad-reticle, and legendary durability of the original ROMEO4T while adding key features requested by professionals.  Illumination control moves to the top, providing easy access with either hand while staying clear of chest rigs and plate carriers when slung. A dedicated night vision override switch makes short work of drastic changes in lighting conditions and by combining MOTAC with a common AAA battery, the ROMEO4XT-PRO is rated for 50,000 hours of runtime.  Like its predecessor, the ROMEO4XT-PRO is IPX8-rated for waterproof and fog proof performance and is tested to MIL-STD-810 to ensure reliable service. SPECIFICATIONS: SIG Sauer ROMEO4XT-PRO Red Dot Sight MAGNIFICATION: 1x OBJECTIVE LENS DIAMETER (MM): 20mm ADJUSTMENT INCREMENTS: 0.5 MOA TOTAL ELEVATION TRAVEL: 100 MOA TOTAL WINDAGE TRAVEL: 100 MOA OVERALL LENGTH: 77mm OVERALL WIDTH: 63mm HEIGHT: 56mm WEIGHT: 7.4oz RETICLE: Ballistic Circle Dot RETICLE COLOR: Red CENTER DOT SIZE: 2 MOA WATERPROOFING: IPX-8 BATTERY: 1x AAA RUN TIME: 50000 hours ILLUMINATION SETTINGS: 9 Daytime - 3 NV MOUNT TYPE: Half Inch Hex Mount COLOR: FDE SKU: SOR44002 UPC: 798681661541

    8 in stock

    £649.99

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