20 mm modèle F2 gun
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The 20 mm modèle F2 gun is a naval defence weapon used by the French Navy. It was developed from the GIAT M693, itself derived from Hispano-Suiza HS.820. It fires the same 20×139 mm round. Wikipedia
Barrel length: 1,970 mm (78 in)
Caliber: 20×139mm
Effective firing range: 1,500 m (4,900 ft) against aerial targets
Muzzle velocity: 1,050 m/s (3,400 ft/s)
Rate of fire: 900 round/min