The Carabine Mitrailleuse 1918, or simply the Ribeyrolles 1918, was an attempt to manufacture an automatic rifle for French forces. It fired what is considered a intermediate cartridge (similar in capabilities to an assault rifle cartridge) at 550-600 rounds per minute. It was to be fitted with a bayonet and bipod.
The Ribeyrolles 1918 Factory is the only variant of the carbine (the other Assault unlock being the Sjögren Inertial shotgun). It is unlocked upon obtaining 50 kills with the Automatico M1918 Factory and obtaining 20 headshots with the MP 18 Optical.
It is notable for being one of two submachine guns with a bipod - the other being the Hellriegel 1915 Defensive - providing long range capability for the kit. Performance is otherwise similar to the MP 18, which has a larger magazine and better hipfire statistics.