SIG Sauer Romeo4S 1x20 2 MOA Solar Red Dot Optic - SOR43021
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Sig Sauer
Overview
The Sig Sauer Romeo4S is a 1x20 red dot optic designed for quick target acquisition, featuring a 2 MOA dot size that provides precise aiming without obstructing your view. The optic is finished in a gray color and utilizes a red reticle for enhanced visibility in various lighting conditions, making it suitable for both tactical and recreational shooting. This optic is commonly found on carbine builds chambered in 5.56 NATO, where speed and accuracy are paramount.
Specifications
SIG Sauer Romeo4S 1x20 2 MOA Solar Red Dot Optic - SOR43021
Available Merchants(4)
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August 2026 on GunPartPicker
SIG Sauer Romeo4S 1x20 2 MOA Solar Red Dot Optic - SOR43021 ranked #70 of the 210 optics builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since February 2026. All time, it ranks #96 of the 481 optics builders have added.
It was hard to find in August 2026, in stock on only 7 of the 20 days we checked, and today only Sportsman's Guide has it in stock. The best price crept up from $316.64 to $439.99 over August 2026. Buying today, the lowest price is $439.99 at Sportsman's Guide, above August's low of $316.64, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
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Magpul MOE-SL Grip Polymer Dark Earth
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 3 →Builds in the community that include the Sig Sauer Romeo4S 1x20 2 MOA Solar Red Dot Optic - SOR43021
| Build | Parts | Total |
|---|---|---|
 | 32 | $3983.36 |
 | 32 | $3983.36 |
 | 13 | $1751.71 |
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