The M9A4 features integral slide cuts to allow for the mounting of optional optic adapter plates. These adapter plates include mounting options for optics with the C-More, ACRO, Docter, Leupold Deltapoint Pro, and RMR footprints. We do not currently carry these adapter plates, but they can be purchased directly from Beretta, and can be found by using the link below:
https://www.beretta.com/en-us/gun-accessories/handguns/kits-parts/beretta-90-series-rdo-plate-trijicon-pattern/