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Patricio, yes, you will need the adapter plate (https://www.sigsauer.com/romeo1-handgun-mounting-kit-sig-sauer-p320.html) : https://www.youtube.com/watch?v=XEOsaSWLjQ4

Patricio, the X5s slide is already cut to accept the Romeo 1. Nothing else is needed. If you watch the video James linked to he doesn't use a adapter plate. It fits the slide perfectly. So no mounting kit necessary. Hope this helps.

Patricio, no, it will mount right to the slide, nothing else needed. Have a great day!