Sig Sauer Romeo 5 Gen II Compact Red Dot Sight - 1x20 (0.5 MOA) - 1 MOA Red Dot - Black

Refreshed with a bold new look, the next generation of SIG SAUER ELECTRO-OPTICS best-selling ROMEO5 series has arrived. The ROMEO5 GEN II provides a durable 1x aiming solution for civilians and armed professionals alike, with a crisp 2 MOA red or green dot emitter powered by a CR2032 battery that can be quickly replaced. Couple with SIG SAUER'S motion-activated MOTAC™ technology, the ROMEO5 GEN II boasts a 40,000 hour runtime under standard usage.

Featuring top mount ambidextrous controls that offer 10 daylight and 2 night vision settings, finding the optimal setting for your environment is quick and intuitive. Capable of withstanding some of the harshest conditions, the ROMEO5 GEN II's IPX7 rating keeps your optic waterproof and fog-proof while the interchangeable I-BEAM Mount maximizes situational awareness.

Upgrade your shooting experience with the proven performance of SIG SAUER'S ROMEO5 GEN II optic. 

Key Features of the Romeo 5 Gen II Compact Red Dot Sight

• Ruggedized Industrial Design
• I-BEAM Mount for maximizing situational awareness
• 12 Settings (10 Day + 2 NV)
• 40,000 hrs Runtime with CR2032 Battery and MOTAC™ Motion Activated
• Top Mount Illumination Controls for Ambidextrous Operation
• Dependable IPX7 Waterproof and Fog-Proof Performance
• Parallax-Free Optical Design

Romeo 5 Gen II Compact Red Dot Sight Technologies

Infinite Guarantee

The Infinite Guarantee promises lifetime coverage on SIG SAUER Electro-Optics, giving owners long-term confidence that their optic is protected for as long as they use it.

LensArmor™

LensArmor refers to abrasion-resistant lens coatings designed to stand up to hard use, helping the glass stay clear, sharp and bright even after exposure to dust, dirt and rough handling.

LenShield™

LenShield is a proprietary Mil-Spec oleophobic coating that helps repel water, oil and debris so the lens surface stays cleaner for longer, supporting a clear sight picture in changing conditions.

Motac™

Motac is a motion-activated illumination system that turns the optic on when movement is detected and turns it off again when stationary, helping to conserve battery life without manual input.

SpectraCoat™

SpectraCoat is an advanced, broadband anti-reflection lens coating that reduces surface reflections across the visible spectrum, helping to maximise light transmission and deliver a bright, high-contrast image.

Romeo 5 Gen II Compact Red Dot Sight Specifications

• Color: Black
• Waterproofing: IPX-7
• Height: 61.5 mm
• Magnification: 1x
• Clear Aperture: 20 mm
• Overall Length: 69.7 mm
• Overall Width: 39.6 mm
• Battery: (1) CR2032
• Weight: 5.5 oz
• Illumination Settings: 12 (10 DT + 2 NV)
• Total Elevation Travel: 100 MOA
• Run Time: 40,000 hrs

Sig Sauer Romeo 5 Gen II Compact Red Dot Sight Review

The Sig Sauer Romeo 5 Gen II Compact Red Dot Sight is a rugged 1x reflex-style optic designed for both civilian shooters and armed professionals who need a fast, reliable aiming solution. It features a crisp 2 MOA red or green dot powered by a single CR2032 battery, supported by MOTAC™ motion-activated technology for an impressive 40,000-hour runtime. With its compact dimensions, advanced lens coatings and IPX7 waterproof, fog-proof construction, this red dot sight is particularly well-suited to demanding environments and dynamic shooting scenarios where rapid target acquisition and reliability are key strengths.

Romeo 5 Gen II Performance & Key Features

Performance on the Romeo 5 Gen II is centred around a parallax-free 1x optical design that facilitates fast, both-eyes-open shooting. The 2 MOA dot provides a precise aiming point that remains visible across a wide range of lighting conditions thanks to 12 illumination settings, including 10 daylight and 2 night-vision options. SpectraCoat™, LensArmor™ and LenShield™ coatings work together to maintain a bright, high-contrast image while protecting the lenses from abrasion, oil and debris.

• Parallax-free 1x design with a crisp 2 MOA red or green dot for rapid, precise aiming.
• 12 illumination settings (10 day + 2 NV) for flexibility from bright daylight to night-vision use.
• MOTAC™ motion-activated illumination delivering up to 40,000 hours of runtime with a single CR2032 battery.
• SpectraCoat™, LensArmor™ and LenShield™ coatings to maximise light transmission and protect the lenses in harsh use.
• Well suited to shooters who need a compact, always-ready sight for fast, reactive shooting.

Romeo 5 Gen II Build Quality & Handling

The Romeo 5 Gen II features a ruggedised industrial design built to withstand tough conditions, backed by an IPX7 waterproof and fog-proof rating. Its compact form factor—69.7 mm in length, 39.6 mm in width and 61.5 mm in height—with a weight of just 5.5 oz helps maintain good balance on the firearm without adding unnecessary bulk. The interchangeable I-BEAM Mount is designed to maximise situational awareness, supporting a comfortable, natural head position and confident handling in use.

Is the Romeo 5 Gen II Easy to Use?

Ease of use is a clear focus on this optic, with top-mounted ambidextrous illumination controls providing quick, intuitive adjustments for both left- and right-handed shooters. The parallax-free design and 20 mm clear aperture create a clean, uncluttered sight picture that is simple to pick up under pressure. The single CR2032 battery is easy to replace, and MOTAC™ reduces the need to constantly manage power settings manually.

• Top-mounted ambidextrous illumination controls for straightforward, intuitive brightness adjustment.
• 20 mm clear aperture for a bright, open viewing window.
• Simple CR2032 battery replacement supported by motion-activated power management.

Key Takeaways of the Romeo 5 Gen II Compact Red Dot

The Romeo 5 Gen II stands out with its combination of a crisp 2 MOA dot, long 40,000-hour runtime and advanced lens coatings, all wrapped in a compact, IPX7-rated housing. While it remains a simple 1x red dot without magnification, that simplicity is a strength for fast target acquisition and instinctive, both-eyes-open shooting. Shooters who value durability, minimal maintenance and an optic that is always ready when motion is detected will appreciate the MOTAC™ system and robust build. Overall, it is a compelling choice for anyone wanting a compact, dependable red dot sight built to handle harsh conditions without compromising clarity or ease of use.

Sig Sauer Romeo 5 Gen II Compact Red Dot Sight FAQs

What type of aiming performance does the Romeo 5 Gen II provide?

The Romeo 5 Gen II offers a 1x, parallax-free optical design with a 2 MOA dot, making it ideal for quick target acquisition and both-eyes-open shooting. The 2 MOA dot is fine enough for precise aiming while still being easy to pick up quickly at closer ranges. This configuration suits dynamic shooting, general-range use and defensive applications where speed and clarity are important.

How many brightness settings does the Romeo 5 Gen II have?

This optic features a total of 12 illumination settings, with 10 dedicated to daylight use and 2 compatible with night-vision devices. These settings allow the shooter to fine-tune dot intensity for bright sun, overcast days or low-light conditions. The broad adjustment range helps keep the 2 MOA dot visible without excessive bloom, regardless of the environment.

How long is the battery life on the Romeo 5 Gen II red dot?

The Romeo 5 Gen II delivers up to 40,000 hours of runtime under standard usage conditions. This impressive battery life is achieved using a single CR2032 cell combined with MOTAC™ motion-activated technology, which powers the optic down when stationary and brings it back on when movement is detected. As a result, shooters benefit from long service intervals and reduced worry about unexpected battery failure.

What kind of weather protection does the Romeo 5 Gen II offer?

With an IPX7 waterproof rating, the Romeo 5 Gen II is designed to withstand immersion up to 1 meter and operate reliably in heavy rain or wet environments. It is also fog-proof, helping to maintain a clear sight picture during rapid temperature changes or humid conditions. This makes it a strong choice for use in challenging outdoor climates.

What lens coatings are used on the Romeo 5 Gen II, and why do they matter?

The optic incorporates multiple advanced coatings, including SpectraCoat™, LensArmor™ and LenShield™. SpectraCoat™ is a broadband anti-reflection coating that enhances light transmission and contrast, while LensArmor™ provides abrasion resistance to withstand rough handling. LenShield™ adds oleophobic protection, helping to repel water, oil and debris so the lens stays cleaner and clearer for longer in the field.

Is the Romeo 5 Gen II suitable for use with night-vision devices?

Yes, the Romeo 5 Gen II includes 2 dedicated night-vision settings among its 12 illumination levels. These reduced-intensity modes help prevent dot bloom when viewed through compatible night-vision equipment. Combined with the 1x magnification, this makes the optic a versatile choice for low-light and night-time shooting setups.

How compact and lightweight is the Romeo 5 Gen II?

The optic is notably compact, measuring 69.7 mm in overall length, 39.6 mm in width and 61.5 mm in height, with a weight of just 5.5 oz. This small footprint helps maintain good balance on the firearm and keeps the overall setup streamlined. Despite its light weight, the design remains rugged enough for hard use.

What is the clear aperture size and how does it affect the sight picture?

The Romeo 5 Gen II has a 20 mm clear aperture, providing a generous viewing window for a compact red dot sight. This helps deliver a bright, uncluttered sight picture that makes it easier to track targets and maintain awareness of the surrounding environment. The combination of aperture size and lens coatings supports a high-contrast, easy-to-use aiming reference.

How user-friendly are the controls on the Romeo 5 Gen II?

The optic uses top-mounted ambidextrous controls, making brightness adjustments simple for both left- and right-handed users. Their placement allows quick access without crowding the side of the sight or interfering with other accessories. Combined with MOTAC™ automatic on/off behaviour, the control layout keeps day-to-day operation straightforward and efficient.

Does the Romeo 5 Gen II come with a robust warranty?

The Romeo 5 Gen II is supported by Sig Sauer’s Infinite Guarantee on Electro-Optics, providing lifetime coverage for the optic. This long-term backing gives owners confidence that their investment is protected for as long as they use it. It also reflects the brand’s confidence in the durability and build quality of the sight.

For more options, explore the full range of SIG SAUER red dot sights here.