Vince, This slide is compatible with either a Leupold DeltaPoint Pro, SIG Romeo1 or Trijicon RMR red dot optic sight systems. Cheers and stay safe!

Copy and paste directly from Grey Ghost Precision website.
"OPTIC CUT COMPATIBLE WITH LEUPOLD DPP, TRIJICON RMR AND SIG ROMEO1 AND ROMEO1PRO (IF THE SLIDE WAS MADE AFTER JANUARY 1ST 2021) AND SUPPLIED SCREWS/SHIM PLATES
Not Compatible with Vortex or Aimpoint Optics"
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"We also took our hybrid MRDS optic cut and added a third option, the SIG ROMEO1. Now you have to option to use a ROMEO1 as well as a Trijicon RMR or Leupold DeltaPoint Pro right out of the box without using bulky adapter plates that only raise the optic further above the bore axis. "
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Full specs here
https://greyghostprecision.com/ggp320-slides/

Comes with RMR cut on the slide. This slide features the new dual optic cutout and is compatible with either a Leupold DeltaPoint Pro, SIG Romeo1 or Trijicon RMR red dot optic sight systems. The manufacturer recommends that the sights and other internal parts be installed by a gunsmith to ensure proper installation is completed. I hope this helps!