The SIG Sauer ROMEO4T-PRO Red Dot Sight is a 1x (non-magnified) enclosed red dot sight with a 20 mm objective lens, a red Ballistic Circle Dot reticle built around a 2 MOA centre dot, running from a single AAA cell for up to 50,000 hours. It weighs 7.4 oz (210 g).
Weight is the reason to choose the PRO over the standard ROMEO4T: at 7.4 oz with a 20 mm objective it is far lighter than the 38 mm-aperture ROMEO4T, and it takes an ordinary AAA cell rather than a coin cell. The reticle is parallax free with unlimited eye relief, and it mounts on a Picatinny hex bolt and spacer system.
Finish: Black — also sold as the ROMEO4T-PRO red dot sight in FDE.
How It Compares
Want the larger 38 mm window and solar power? The ROMEO4T is the bigger sight. Want a quad-reticle version? The ROMEO4XT-PRO adds more reticle options. Browse the SIG ROMEO range, all enclosed red dot sights and optics for straight-pull rifles.
Ideal For
- Civilian Service Rifle and practical rifle shooting
- Lightweight straight-pull AR-15 builds
- Practical shotgun and 3-Gun stages
- Shooters who prefer an AAA cell to a coin cell
Key Features
-
Reticle: Ballistic Circle Dot (red), 2 MOA centre dot
-
Illumination: 9 daylight / 3 night-vision settings
-
Turrets: 0.5 MOA per click; 100 MOA elevation and 100 MOA windage
-
Electronics: AAA cell, up to 50,000 hours
-
Housing: 7075-T6 aluminium, IPX8
-
Weight: 7.4 oz (210 g)
Technical Specifications
| Magnification |
1× (non-magnified) |
| Objective Lens Diameter |
20 mm |
| Reticle |
Ballistic Circle Dot (red), 2 MOA centre dot |
| Adjustment Increment |
0.5 MOA per click |
| Elevation / Windage Range |
100 MOA / 100 MOA |
| Parallax / Eye Relief |
Parallax free / unlimited |
| Illumination Settings |
9 day / 3 night vision |
| Battery |
AAA — up to 50,000 hours |
| Housing |
7075-T6 aluminium, IPX8 |
| Finish |
Black |
| Weight |
7.4 oz (210 g) |
| Mount |
Picatinny (hex bolt and spacer system) |
| Warranty |
SIG Sauer Infinite Guarantee |
| SKU / MPN / UPC |
SOR44101 / SOR44101 / 798681671397 |
What's Included
- SIG Sauer ROMEO4T-PRO red dot sight
- AAA battery, Picatinny mount hardware and spacer, 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 battery does the SIG Sauer ROMEO4T-PRO use?
The SIG Sauer ROMEO4T-PRO runs on a single AAA cell, rated for up to 50,000 hours.
What is the difference between the SIG Sauer ROMEO4T-PRO and the ROMEO4T?
The SIG Sauer ROMEO4T-PRO has a 20 mm objective and weighs 7.4 oz on an AAA cell, while the ROMEO4T has a larger 38 mm aperture and is solar-assisted with a CR2032.
Is the SIG Sauer ROMEO4T-PRO night-vision compatible?
Yes — the SIG Sauer ROMEO4T-PRO has 9 daylight and 3 night-vision brightness settings.
How is the SIG Sauer ROMEO4T-PRO adjusted for zero?
The SIG Sauer ROMEO4T-PRO adjusts in 0.5 MOA per click, with 100 MOA of elevation and 100 MOA of windage available.
How does the SIG Sauer ROMEO4T-PRO mount?
The SIG Sauer ROMEO4T-PRO fits a Picatinny rail using a hex bolt and spacer system, so height can be set to suit the rifle.
