SIG Sauer Romeo2


The SIG Sauer® Romeo2 is a professional-grade red dot sighting solution for the modern semi-automatic pistol.

Available in 3 MOA and 6 MOA versions.

Looking for a custom slide with your optic? Order a Grayguns Custom Slide for your P320 and we'll professionally install the optic for free!
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The SIG Sauer Romeo2 red dot sight is purpose-built for adverse conditions.

The red dot sight is available in 3 or 6 MOA configurations, with 15 brightness settings to ensure rapid target engagement. The Romeo2 features a high-efficiency, point source LED emitter and molded aspheric glass lens. In addition, the sight utilizes a high-performance red notch reflector coating for excellent brightness and light transmittance with zero distortion.

The 7075 aluminum housing and ruggedized steel shrouds protect the Romeo2 from extreme impacts and drops. In addition, the Romeo2 maintains 25,000 hours of battery life and comes with a Motion Activated Illumination System (MOTAC) to automatically power the optic on and off.

The Romeo2 is compatible* with the following configurations and footprints:

  • SIG Sauer PRO/R2 slide cuts
  • DeltaPoint® Pro footprints
  • Shield RMS/SMS footprints

We suggest you review the Romeo2 Operators Manual for additional information.

Romeo2 Features

  • The Romeo 2 has a molded glass aspheric lens with high performance coatings for superior light transmittance and zero distortion.
  • Two steel shrouds are included for three different optic configurations, including fully enclosed and sealed with a polycarbonate rear window
  • The Romeo2 shares the Romeo1 Pro footprint and can be direct-mounted to any SIG Sauer pistol with a Pro-Slide Cut
  • Users can change the battery quickly. Release the push button to engage the spring-loaded side battery tray
  • Uses widely-available CR2032 batteries
  • Motion-activated illumination system (MOTAC) that powers up when it senses motion and powers down when it does not
  • Magnetic activation (MAGNETAC) automatically turns the optic off when holstered in a compatible holster and instantly turns the optic on when drawn from the holster
  • Dark adaptive reticles and coatings (D.A.R.C.) technology provides ideal reticle brightness and target clarity while using a Gen3+ night vision device
  • The Romeo2 was designed, developed, tested and assembled in the U.S.A.
  • SIG Sauer Electro-Optics Infinite Guarantee™ and SIG Sauer Electronic Component Limited 5-Year Warranty

SIG Sauer Romeo2 Compatibility

  • P320 XFull
  • P320 XCompact
  • P320 XFive Legion
  • P320 Pro Series
  • P320 M17
  • M17
  • M18
  • All Pro-Cut Slides

The Romeo2 sight is incompatible with slides cut to accept a standard Romeo1.

* Grayguns and SIG can not guarantee compatibility with your pistol. New pistols may be released with the footprints listed. However, design differences – including the amount of thread engagement – may make the sight incompatible with your gun.

  • Romeo2 3MOA, MPN SOR21300, UPC 798681647699
  • Romeo2 6MOA, MPN SOR21600, UPC 798681647705

Additional information

Weight .6 lbs
Package Dimensions 4 × 6 × 2.5 in
Dot Size

3 MOA, 6 MOA

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Many parts sold by Grayguns - including but not limited to triggers, trigger kits, internal components and spring kits - are intended for installation by a qualified armorer or gunsmith who is familiar with the firearm.

Although kits fit with no issues in a great majority of pistols, Grayguns cannot guarantee perfect functionality in every instance.

Due to varying tolerances present in all mass-produced firearms, professional fitting by a qualified armorer who is familiar with the pistol's action may be required.

Grayguns offers installation services for all parts kits we offer. If you have any issues or questions about the installation process, STOP IMMEDIATELY and contact the Grayguns Customer Service Team.