Ribeyrolles 1918 automatic carbine
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 detachable magazine and had an effective range of 400 meters.
Source: Wikipedia — Ribeyrolles 1918 automatic carbine (CC BY-SA 4.0)