SIG Sauer ROMEO5 Gen II Red Dot Sight 2 MOA Dot
£229.99
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SIG Sauer ROMEO5 Gen II Red Dot Sight 2 MOA Dot
£229.99
At a glance
- Sight type
- Enclosed
- Reticle
- Single dot
- Dot size
- 2 MOA
- Fits
- Rifle
- Delivery within 10 business days
- Estimated delivery:
- 30-day returns
- UK-based specialist support
- Pay in 3 interest-free payments of £76.66 with Klarna
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Details
Description
SIG Sauer ROMEO5 Gen II Red Dot Sight makes its biggest change where it counts day to day: the battery. The CR2032 loads from a side tray, so it changes on the gun with no re-zero, and MOTAC wakes the 2 MOA dot when the rifle moves and shuts it off when it does not — around 40,000 hours from one cell.
How It Compares
Prefer a green dot? See the ROMEO5 Gen II Green. Want a ballistic circle-dot and a AAA battery? The ROMEO5XDR. Want magnification in the box? The ROMEO5 + JULIET3 combo. Browse more rifle dot sights and read how to zero a red dot sight.
Ideal For
- First red dot on an AR-15 or carbine
- Shooters who want mounts in the box rather than as an extra
- Both-eyes-open shooting at close range
- A base optic to pair with a JULIET magnifier later
Key Features
- 2 MOA red dot in a 1x20 mm tube
- MOTAC motion activation; around 40,000 hours
- Side-loading CR2032 — no re-zero
- 10 daylight and 2 night-vision settings; 0.5 MOA clicks
- IPX7 waterproof and fog-proof; low mount and co-witness riser included
Technical Specifications
- SKU / MPN / UPC: SKU SOR5101 / MPN SOR5101 / UPC 798681694600
- Reticle: 2 MOA red dot
- Magnification: 1x, parallax-free, unlimited eye relief
- Objective: 1x20 mm
- Brightness settings: 10 daylight + 2 night-vision, MOTAC motion activation
- Windage / elevation per click: 0.5 MOA
- Battery: 1 × CR2032, side-loading
- Battery life: ~40,000 hours
- Housing: Aluminium
- Waterproof: IPX7, fog-proof
- Mount: Picatinny — low mount and co-witness riser included
What's Included
- SIG Sauer ROMEO5 Gen II red dot sight
- Low mount and co-witness riser
- CR2032 battery
Why buy from Red Dot Sight UK
A UK specialist in red dot sights, holographic sights and magnifiers from Trijicon, EOTech, Holosun and SIG Sauer — genuine optics, secure checkout and UK-based support.
The detail
Technical Specifications
| Sight type | Enclosed |
|---|---|
| Dot colour | Red |
| Reticle | Single dot |
| Dot size | 2 MOA |
| Fits | Rifle |
| Brand | SIG Sauer |
| Type | Red Dot Sight |
| SKU | SOR5101 |
Fitment
Compatibility
Mounting Footprint
Confirm the optic's footprint matches your firearm's cut or plate.
Rail Compatibility
Pair with a matching Picatinny mount for rifle and carbine platforms.
Always confirm your firearm's optic cut or rail matches the footprint before purchase. Our guide to red dot sight footprints explains how to match an optic to your firearm. If unsure, contact our team for fitment advice.
Complete Your Setup
Help & guidance
Product FAQs
Do I need to buy a mount for the SIG Sauer ROMEO5 Gen II?
No, a low Picatinny mount and a co-witness riser are both in the box with the SOR5101. Nothing extra is needed to get it on an AR-15 rail.
What is MOTAC on the ROMEO5 Gen II?
MOTAC is SIG's motion-activated illumination, which powers the dot up when the optic senses movement and down when it is left alone. That is how the CR2032 in the SOR5101 reaches around 40,000 hours.
Will changing the battery knock the zero on the ROMEO5 Gen II?
It should not, because the CR2032 slides in from a side tray with the optic still mounted. That is the main change the Gen II makes day to day.
ROMEO5 Gen II or ROMEO5XDR, which should I choose?
The Gen II keeps things simple with a 2 MOA dot on a CR2032 coin cell, while the XDR adds a selectable circle around the dot and runs a AAA battery. Pick the Gen II for a straightforward first red dot.
What size dot does the SIG Sauer ROMEO5 Gen II SOR5101 have?
It has a 2 MOA red dot in a 1x20 mm tube. It suits both-eyes-open shooting at close range.
How many brightness settings does the ROMEO5 Gen II have?
The SOR5101 has 10 daylight settings and 2 night-vision settings, plus MOTAC motion activation.
Is the ROMEO5 Gen II night-vision compatible?
Yes, it includes 2 night-vision brightness settings alongside the 10 daylight settings.
Is the ROMEO5 Gen II waterproof?
Yes, the SOR5101 is IPX7 waterproof and fog-proof, in an aluminium housing.
What is the click value on the ROMEO5 Gen II?
Windage and elevation adjust in 0.5 MOA per click.
What magnification and eye relief does the SOR5101 have?
It is a 1x20 mm optic, parallax-free with unlimited eye relief.
What is in the box with the ROMEO5 Gen II SOR5101?
The box contains the SIG Sauer ROMEO5 Gen II red dot sight, a low mount and co-witness riser, and a CR2032 battery.
How long does UK delivery take for the ROMEO5 Gen II?
Estimated UK delivery is 10 business days. It ships as genuine UK stock, so there are no import fees to pay on arrival. Checkout is secured by Shopify.
No questions match your search.
Further reading
Guides picked for this optic - the brand range, the format, and how to set it up.
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Orders are dispatched from the UK. Full details, options and timescales are on our shipping policy.
If something isn't right, our returns policy explains how to arrange a return or exchange.
Every order is covered by our 30-day returns policy and your statutory consumer rights. Some products are also supplied with a manufacturer warranty; that cover is provided by the manufacturer rather than by Red Dot Sight UK and varies by brand.