Nice slide. rmr warning: you will need special screws from sig sauer to mount rmr red dot - SIG SAUER P226 PRO-Cut Optic Ready Slide Assembly

I purchased this slide so that I could mount my Trijicon RMR to the slide. I also bought a new barrel, recoil guide rod, and recoil spring

Runs great and looks great, and I love having a red-dot for my P226.

To mount the RMR, i needed to purchase mounting screws and mounting plate
it did NOT come with the proper mounting screws for and RMR
(I took this red dot off my glock and the glock screws I had did not work)

unfortunately I did not measure the screw pattern and size before I mounted the optic.

here is the parts number for the plate and screws
SEALING PLATE KIT, TRIJICON RMR/SRO
Sig Sauer Part number 1303084-R

Optics planet does sell these
https://www.opticsplanet.com/sig-sauer-sealing-plate-kit-trijicon-rmr-sro.html