3.7 cm Flak 18/36/37
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The 3.7 cm Flak 18/36/37 was a series of anti-aircraft guns produced by Nazi Germany that saw widespread service in the Second World War. The cannon was fully automatic and effective against aircraft flying at altitudes up to 4,200 m. The cannon... Wikipedia
Breech: gas-operated bolt
Effective firing range: 4,200 m (4,600 yd) (anti-aircraft)
Feed system: 6-round clips
Maximum firing range: 7,995 m (8,743 yd) (ground range)
Muzzle velocity: 770–840 m/s (2,500–2,800 ft/s)
No. built: 20,243 (Germany); 360 (Romania)
Place of origin: Nazi Germany