Carver Custom bridge mount for a RDS on a glock 17/34 sized frame, I had it mounted on a gen 4 but the carver website also says it will fit a gen 3.  Gas pedal thumb rest is mounted and included.  2x top plate mounts, one for RMR compatible footprints (SRO, holosun, Swampfox, etc.) and the other is for Burris compatible footprints (vortex venom/viper, etc. )

Price is OBO.

https://www.carvercustom.com/ecommerce/carver-handgun-scope-mounts/carver-glock-scope-mounts/competition-glock-scope-mounts/carver-competition-sts-burris-glock-mount.cfm