The SIG Sauer ROMEO5 Gen II Red Dot Sight is a 1x (non-magnified) micro red dot sight with a 20 mm objective and a 2 MOA red dot, weighing 5.1 oz (145 g) and supplied with both a low mount and a Picatinny riser.
The ROMEO5 is the sight most British AR-pattern and straight-pull builds start with, and Gen II keeps what made it popular: a parallax-free, unlimited-eye-relief window, MOTAC motion activation and a CR2032 that runs up to 50,000 hours. Because both mounts are in the box you can set absolute or lower-1/3 co-witness without buying anything else.
How It Compares
Prefer a green dot? The ROMEO5 Gen II green projects the same 2 MOA dot in green. Want a circle-dot reticle? The ROMEO5XDR Gen II adds a 65 MOA circle. Want a magnifier included? The ROMEO5 Gen II with JULIET3-Micro magnifier is the combo. Browse the SIG ROMEO range, all rifle red dot sights and optics for straight-pull rifles.
Ideal For
- Civilian Service Rifle and practical rifle shooting
- Straight-pull AR-15 and lever-release rifles
- Practical shotgun and 3-Gun stages
- Rimfire and .22 LR rifles wanting a light, simple sight
Key Features
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Reticle: 2 MOA dot, red
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Turrets: 0.5 MOA per click; 100 MOA elevation and 100 MOA windage
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Optics: parallax free, unlimited eye relief
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Electronics: CR2032, up to 50,000 hours
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Mount: Picatinny — low mount and riser both included
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Housing: aluminium, IPX7, shockproof and fogproof
Technical Specifications
| Magnification |
1× (non-magnified) |
| Objective Lens Diameter |
20 mm |
| Reticle |
2 MOA Dot, red |
| Adjustment Increment |
0.5 MOA per click |
| Total Elevation / Windage Travel |
100 MOA / 100 MOA |
| Parallax / Eye Relief |
Parallax free / unlimited |
| Illumination Settings |
Day and night-vision settings |
| Battery |
CR2032 — up to 50,000 hours |
| Housing / Finish |
Aluminium, Black |
| Water Resistance |
IPX7; shockproof and fogproof |
| Weight |
5.1 oz (145 g) |
| Dimensions |
2.47 in × 1.5 in × 1.5 in (63 × 38 × 38 mm) |
| Mount |
Picatinny (low mount and riser included) |
| Origin |
Assembled in USA |
| Warranty |
SIG Sauer Infinite Guarantee |
| SKU / MPN / UPC |
SOR5101 / SOR5101 / 798681694600 |
What's Included
- SIG Sauer ROMEO5 Gen II red dot sight
- Low Picatinny mount and riser, CR2032 battery, documentation
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and SIG's Infinite Guarantee.
Frequently Asked Questions
What dot size does the SIG Sauer ROMEO5 Gen II have?
The SIG Sauer ROMEO5 Gen II projects a 2 MOA red dot.
Does the SIG Sauer ROMEO5 Gen II come with a mount?
Yes — the SIG Sauer ROMEO5 Gen II is supplied with both a low Picatinny mount and a riser, so you can set absolute or lower-1/3 co-witness without buying extra parts.
What battery does the SIG Sauer ROMEO5 Gen II use?
The SIG Sauer ROMEO5 Gen II runs on a CR2032 cell, rated for up to 50,000 hours.
How is the SIG Sauer ROMEO5 Gen II adjusted for zero?
The SIG Sauer ROMEO5 Gen II adjusts in 0.5 MOA per click, with 100 MOA of elevation and 100 MOA of windage available.
How much does the SIG Sauer ROMEO5 Gen II weigh?
The SIG Sauer ROMEO5 Gen II weighs 5.1 oz (145 g).
Is the SIG Sauer ROMEO5 Gen II waterproof?
The SIG Sauer ROMEO5 Gen II is rated IPX7, and is both shockproof and fogproof.
