This French remote weapons station mounts dual guns, a 7.62mm machine gun and a 20mm cannon:
Though undergunned for mech-on-mech combat, I’ve got to think this combination would be great for lightweight 4×4 and 6×6 security-type vehicles.
See some images of the ARX20 mounted on a French VAB on this message board.
The image in this post is from a collection taken at this year’s Eurosatory exhibition in Paris.
Thanks to the reader who sent the link.