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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
Available Merchants(9)
Prices checked
Price Alert
November 2026 so far on GunPartPicker
SIG Sauer Romeo 5 Gen II Red Dot, Black - SOR5101 is the third most added optic on GunPartPicker so far in November 2026, behind the EOTECH XPS2 Holographic Sight, Tan - XPS2-0TAN, with about 5% of all optics added to builds. Up from #5 in August, September and October. Builds with this optic are mostly chambered in 5.56 NATO (68%, then 300 Blackout 17%), split between mid-length (50%) and carbine-length (27%) gas systems, and mostly AR-15 (90%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 8 of the 9 retailers we track have it in stock. It dipped to $85 at BattleHawk Armory for a stretch in October 2026, well under its usual $139.99, so sales do come around. Buying today, the lowest price is $119.60 at KY Gun Company, above October's low of $85, so a better deal may come 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 hundreds of 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
Breek Arms AR-15 Warhammer MOD2 Ambidextrous 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 Romeo 5 Gen II Red Dot, Black - SOR5101
| Build | Parts | Total |
|---|---|---|
 | 16 | $1599.36 |
 | 16 | $2017.00 |
 | 21 | $1797.29 |
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