The SIG Sauer ROMEO4T-PRO, part number SOR44101, is a 1x enclosed red dot sight with a 20 mm objective and SIG's Quad Ballistic Circle Dot reticle built around a 2 MOA centre dot.
A circle-dot with ballistic holds under it, in a sealed body that weighs 6.3 oz — the ROMEO4T-PRO is the compact member of the ROMEO4 family rather than the big-window one.
The sight measures 62.5 x 67.5 x 50 mm and mounts to a Picatinny rail on SIG's half-inch hex system, which is supplied with two heights so the optic can be set to co-witness or to sit above the irons. Illumination runs from a CR2032 cell rated at 50,000 hours, with 9 daylight settings and 3 night-vision levels.
Zeroing is 0.5 MOA per click, with 100 MOA of elevation and 100 MOA of windage on tap, which is enough travel for an out-of-square rail or an offset mount. It suits Civilian Service Rifle, practical rifle and 3-Gun work, and a lightweight straight-pull build where the weight over the receiver is worth watching. We do not quote a housing material, sealing rating, parallax figure or eye relief for this model, because SIG do not publish them on the ROMEO4T-PRO page.
Why shooters choose the ROMEO4T-PRO
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Reticle — Quad Ballistic Circle Dot with a 2 MOA centre dot
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Objective — 20 mm, 1x non-magnified
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Brightness — 9 daylight and 3 night-vision settings
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Turrets — 0.5 MOA per click, 100 MOA elevation and 100 MOA windage
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Power — one CR2032 cell rated at 50,000 hours
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Mount — Picatinny half-inch hex system, two heights supplied
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Size — 62.5 x 67.5 x 50 mm, 6.3 oz
What the ROMEO4T-PRO fits
It fits any MIL-STD-1913 Picatinny rail through its own hex mount, which covers AR-pattern flat-tops, rail-equipped shotguns and straight-pull carbines. The same sight is stocked in FDE; the larger-aperture models are the ROMEO4T and the ROMEO4XT-PRO. Browse all enclosed red dot sights.
Specifications
| Magnification |
1x (non-magnified) |
| Objective |
20 mm |
| Reticle |
Quad Ballistic Circle Dot, red, 2 MOA centre dot |
| Brightness |
9 daylight / 3 night-vision settings |
| Adjustment |
0.5 MOA per click |
| Adjustment Range |
100 MOA elevation / 100 MOA windage |
| Battery |
CR2032, up to 50,000 hours |
| Mount |
Picatinny, half-inch hex with two heights |
| Dimensions |
62.5 x 67.5 x 50 mm |
| Weight |
6.3 oz |
| Finish |
Black |
| MPN |
SOR44101 |
A sealed circle-dot for a carbine, with enough turret travel to zero it wherever it ends up sitting. Order the ROMEO4T-PRO today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: Red Dot Sights, ROMEO4T-PRO FDE or browse all SIG Sauer.
