Carabine-mitrailleuse Ribeyrolles Modèle 1918
Ribeyrolles 1918
Type	Automatic rifle/light machine gun/assault rifle
Place of origin	France
Service history
Used by	French Army
Wars	World War I
Production history
Designed	1916[citation needed]
Produced	1916 to 1920[citation needed]
Specifications
Weight	5.1 kg (11 lb) unloaded[citation needed]
Length	1,090 mm(43 in)[citation needed]
Barrel length	450 mm (18 in)[citation needed]
Cartridge	8×35mm Ribeyrolle
Action	Direct blowback[1]
Rate of fire	550–600 rounds per minute[citation needed]
Muzzle velocity	570 m/s (1,900 ft/s)[citation needed]
Effective firing range	400 m (440 yd)[1]
Feed system	25-round box magazine
Sights	Iron sights

The Ribeyrolles 1918 was an attempt to manufacture an automatic rifle for the French forces. It was chambered in the experimental 8×35mm round, used straight blowback, was fed from a 25-round magazine and had an effective range of 400 meters. The cartridge, arguably the first purpose-built intermediate cartridge, was obtained by necking down the .351 Winchester Self-Loading.^[1] Another source indicates that it was chambered in a cartridge designated 8×32mmSR.^[2]

Its official name was Carabine Mitrailleuse 1918^{[citation needed]} ("Machine Carbine 1918" in English); in a 2007 book it appears as "fusil automatique Ribeyrolles 1918".^[2] The Ribeyrolles had the distinction of being fitted with a lightweight bipod on the front (indicating an intended use as a squad automatic weapon) and a rifle bayonet identical to that of the Berthier Model 1907/15.