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Sig Sauer
Overview
The Sig Sauer Romeo5 is a compact red dot sight designed for quick target acquisition, featuring a 2 MOA dot for precise aiming. It utilizes a Picatinny mounting interface, making it easy to attach to your rifle setup. This optic is particularly popular in builds utilizing a mid-length gas system chambered in 5.56 NATO, providing a reliable sighting solution for various shooting scenarios.
Specifications
Available Merchants(5)
Prices checked
Stock Alert
October 2026 on GunPartPicker
SIG Sauer ROMEO5 1x20mm Red Dot Sight, Black - R52001 ranked #28 of the 220 optics builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #29 of the 587 optics builders have added. Builds with this optic are mostly chambered in 5.56 NATO (71%, then 300 Blackout 12%), split between mid-length (44%) and carbine-length (31%) gas systems, and mostly AR-15 (89%).
It was hard to find in October 2026, in stock on only 6 of the 17 days we checked, and today none of the 5 retailers we track has it in stock right now. Prices barely moved in October 2026, holding around $199.99, with no real sale all month. Listed prices start at $104.99 at Sportsmans Outdoor Superstore for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Read the guide: AR-15 Red Dot & Optic Guide →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Smith & Wesson M&P15 Complete Lower 5.56x45mm/.223 Remington, Black - 812002
Tacfire 7" Complete Upper Assembly 5.56x45mm 1:8, Black - BU-556-7
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
Radian Raptor Slim Line Ambidextrous AR-15 Charging Handle - Black
Bravo Company M16 Bolt Carrier Group Black
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all builds →Builds in the community that include the Sig Sauer Romeo5 1x20mm Red Dot Sight, Black - R52001
| Build | Parts | Total |
|---|---|---|
 | 13 | $440.57 |
 | 28 | $2147.05 |
 | 16 | $912.72 |
 | 11 | $1090.01 |
| 20 | $3171.82 |
| 17 | $1477.97 |
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