The SIG Sauer ROMEO5 Gen II is the optic that made a genuinely reliable red dot affordable — and the Gen II refines a proven design with cleaner controls and SIG's full feature set. A crisp 2 MOA red dot sits in a compact 20mm tube, ideal for fast both-eyes-open shooting on AR-15s, .22 rifles, PCCs and rimfire builds.
SIG's MOTAC (Motion-Activated Illumination) powers the dot up the moment you move the rifle and shuts it down when it sits idle, stretching battery life toward the 50,000-hour mark on a single CR2032. It ships with both a low mount and an absolute co-witness riser, so it works straight out of the box on flat-top rifles, and it is waterproof (IPX7), fog- and shock-proof, backed by SIG's Infinite Guarantee. In stock for fast UK dispatch.
KEY FEATURES
- 2 MOA red dot reticle for precise aiming
- MOTAC (Motion Activated Illumination) system
- Compact and lightweight design
- Durable aluminium housing
- Multiple brightness settings including night vision compatibility
- 1× magnification for rapid target acquisition
- Parallax-free with unlimited eye relief
- Includes low mount and absolute co-witness riser
TECHNICAL SPECIFICATIONS
| Magnification |
1× |
| Objective Lens Diameter |
20 mm |
| Reticle |
2 MOA Dot |
| Reticle Colour |
Red |
| Adjustment Type |
MOA |
| Adjustment Increment |
0.5 MOA |
| Total Elevation Travel |
100 MOA |
| Total Windage Travel |
100 MOA |
| Parallax |
Parallax Free |
| Eye Relief |
Unlimited |
| Illumination Settings |
Day + Night Vision |
| Battery Type |
CR2032 |
| Battery Life |
Up to 50,000 hours |
| Housing Material |
Aluminium |
| Finish |
Black |
| Waterproof Rating |
IPX7 |
| Shockproof |
Yes |
| Fogproof |
Yes |
| Weight |
5.1 oz |
| Dimensions (L × W × H) |
2.47" × 1.5" × 1.5" |
| Mount Type / Footprint |
Picatinny (Low + Riser Mount Included) |
| Country of Origin |
Assembled in USA |
| Warranty |
SIG Sauer Infinite Guarantee |
| UPC |
798681694600 |
| MPN |
SOR5101 |
WHAT'S INCLUDED
- SIG Sauer ROMEO5 Gen II Red Dot Sight
- Low Mount
- Riser Mount (Absolute Co-Witness)
- CR2032 Battery
- Lens Covers
- Adjustment Tool
- User Manual
UK Delivery & Support
This SIG Sauer ROMEO5 Gen II is UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based aftersales support and SIG Sauer's Infinite Guarantee.
Frequently Asked Questions
What is MOTAC?
SIG's Motion-Activated Illumination — the dot powers on the instant it senses movement and shuts off when the optic sits still, conserving the battery without you touching a button.
Does it come with mounts?
Yes — both a low mount and an absolute co-witness riser are included, so it works on flat-top rifles out of the box.
Is it night-vision compatible?
Yes — it includes dedicated night-vision brightness settings alongside daylight levels.
What battery does it use and how long does it last?
A single CR2032, rated for up to 50,000 hours thanks to MOTAC.
What warranty does it carry?
SIG Sauer's Infinite Guarantee — a fully transferable lifetime warranty.
