Sig has many variations in models and in optic cuts. Our optic plates support the Romeo 1 Pro Cut, with the rear side remaining after the optic cover plate is removed. These will also work for the SIG P211 GTO. 

Our plates for these models offer a front dovetail to catch under the slide, recoil lugs to prevent the optic from twisting left to right, and, of course, come hard anodized black to last a lifetime. Included in the package are all the Hardware, a Torx bit, a small tube of Vibratite, and detailed installation instructions. We even manufactured 6-40 screws for this platform to include them with the plate purchase.

SIG has a plethora of "Romeo 1 Pro Cuts with and without RMR Holes." Please look at the pictures in the listing and make sure they match to confirm compatibility with which plate. If your plate only has 1 slit down the center, it is not compatible.

Holosun 509T DOGTAG provides a lower 1/8th co witness with SIG #8 sights. 

Holosun EPS/EPS Carry adapter provides a lower 1/3 co-witness with SIG #8 sights.

RMR Footprint adapter provides a lower 1/5th co witness with SIG #8 sights.

GTO P211 will co-witness with the EPS/EPS Carry/RMR Footprints on most optics, but not with the 509T.

Different guns cycle at different rates and with different forces. Some screws are thicker than others and hold optics and plates of different weights. We recommend replacing screws every 10,000 rounds to minimize the risk of screw failure.