Calculated Kinetics Sig Sauer P211/P320 Adapter Plate Trijicon RMR Black. Calculated Kinetics 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. Calculated Kinetics plates for these model 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 is all the Hardware Torx bit 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 it matches to confirm compatibility for which plate. If your plate only has 1 slit down the center it is not compatible. Specifications for Calculated Kinetics Sig Sauer P211/P320 Adapter Plate: Manufacturer: Calculated Kinetics Color: Black Finish: Anodized Gun Model: SIG Sauer P320 Gun Make: SIG Sauer Included Accessories: SIG Sauer P211 GTO Red Dot Sights-Footprint: RMR Package Contents: Calculated Kinetics Sig Sauer P211/P320 Adapter Plate Hardware Torx Bit Vibratite Install Card What firearm models does the manufacturer say Calculated Kinetics Sig Sauer P211/P320 Adapter Plate is compatible with? The manufacturer says that Calculated Kinetics Sig Sauer P211/P320 Adapter Plate is compatible with SIG Sauer P320Calculated Kinetics SIG320-RMR: Sig Sauer P211/P320 Adapter Plate Trijicon RMR Black