World War I aircraft guns

light machine gun

7.7 mm medium machine gun

7.9 mm heavy machine gun

heavy machine gun

series of autocannons

8 mm medium machine gun

submachine gun

7.9 mm machine gun aircraft armament

20 mm autocannon aircraft armament

1910s recoilless rifle design by Cleland Davis

40 mm infantry gun and aircraft armament

The Fokker-Leimberger was an externally powered, 12-barrel rifle-caliber rotary gun developed in Germany during the First World War. The action of the Fokker-Leimberger differed from that of a Gatling in that it employed a rotary split-breech design, also known as a "nutcracker".