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Based on the stock pictures, the holster does not touch the red dot sight area at all. I recommend contacting Sig customer service. I hope this helps!

Yes you can use an MRD optic with this holster, look here the cover plate is well clear of the kydex sides. https://www.classicfirearms.com/sig-sauer-hol365xlapxrh-holster-365xl-appendix-carry/

James, absolutely yes. The slide portion for the Red Dot is not obstructed with this holster. Cheers and stay safe!