SIG Sauer Romeo 5 Gen II Red Dot, Black - SOR5101
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Sig Sauer
Overview
The Sig Sauer Romeo 5 Gen II Red Dot is a compact optic designed for quick target acquisition, featuring a 2 MOA dot for precision aiming. With a Picatinny mounting interface, it easily attaches to your rail system, making it a versatile choice for various setups. This optic is commonly found on mid-length gas system builds chambered in 5.56 NATO, providing an efficient sighting solution for a range of shooting applications.
Specifications
September 2026 so far on GunPartPicker
SIG Sauer Romeo 5 Gen II Red Dot, Black - SOR5101 is the fifth most added optic on GunPartPicker so far in September 2026, behind the EOTECH EXPS3-2 HWS and G43 Magnifier, with about 4% of all optics added to builds. That's its 2nd straight month at #5. Builds with this optic are mostly chambered in 5.56 NATO (71%, then 300 Blackout 24%), split between mid-length (53%) and carbine-length (33%) gas systems, and mostly AR-15 (85%, then AR-10 15%).
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 9 of the 11 retailers we track have it in stock. It dipped to $99.99 at BattleHawk Armory for a stretch in August 2026, under its usual $109.99 to $119.99, so sales do come around. Buying today, the lowest price is $99.99 at Sportsmans Outdoor Superstore, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
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Frequently Built With
The part most often added in each category by the 175 builds that include this one
Smith & Wesson M&P15 Complete Lower 5.56x45mm/.223 Remington, Black - 812002
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger
Magpul AR-15 MOE Stock Collapsible Mil-Spec Black
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Magpul AFG-2 Angled Fore Grip - 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 3 →Builds in the community that include the Sig Sauer Romeo 5 Gen II Red Dot, Black - SOR5101
| Build | Parts | Total |
|---|---|---|
 | 16 | $1651.69 |
 | 16 | $1942.17 |
 | 21 | $1774.19 |
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