Tokyo Marui have released their own Micro Pro Sight which was made to fit the sight mount allowing the Red Dot to fit on the G series. It will also fit on any 20mm rail system so a vast array of products will allow it.
The screws at the rear, on top and on the right side, will allow the user to adjust the dot horizontally and vertically.
This red dot does NOT have RMR mount, you can buy it seperately.
CR2032 battery included.