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Sig Sauer
Overview
The Sig Romeo 2 is a black reflex optic featuring a 3 MOA red dot reticle, designed to enhance target acquisition and accuracy for your AR-15 build. Its 6-dot size allows for precise aiming in various lighting conditions, making it suitable for quick target transitions. This optic is often found in tactical and competitive shooting builds, where speed and precision are paramount.
Specifications
Available Merchants(8)
Prices checked
Price Alert
September 2026 on GunPartPicker
SIG Romeo 2 3 MOA Red Dot Sight, Black - SOR21300 ranked #59 of the 203 optics builders added on GunPartPicker in September 2026. Builders have been adding it to their builds on GunPartPicker since June 2026. All time, it ranks #109 of the 535 optics builders have added.
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today all 8 retailers we track have it in stock. It dipped to $615.99 at Sportsman's Guide for a stretch in September 2026, well under its usual $699.99, so sales do come around. Buying today, the lowest price is $615.99 at Sportsman's Guide, which matches the best price we saw in September.
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
Sharps Bros Showdown Stripped Lower Receiver - Black, Unique Design and High-Performance for Custom AR Builds - SBLR11
Rise Armament Advanced Performance Trigger, Red - RA-535-RED-ARP
Magpul DT Carbine Stock - Mil-Spec - FDE - MAG1377-FDE
Streamlight ProTac Rail Mount HL-X Laser 1000 Lumen Weapon Light with Tape Switch - CR123A
Spikes Tactical T3 Tungsten Buffer, Black - SLA00T3
Strike Industries End Plate and Anti-Rotate Castle Nut for Receivers, Red - SI-AR-UL-MFEP&ACN-RED
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.
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