M621 cannon

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M621
Type Automatic cannon
Place of origin Flag of France France
Production history
Designer GIAT Industries
Manufacturer GIAT Industries (currently Nexter)
Specifications
Weight 45.5 kg
Length 2,207 mm
Width 202 mm (in mount)
Height 245 mm (in mount)

Cartridge 20x102mm
Action Blowback operated
Rate of fire 800 rounds/min
Muzzle velocity 1,005 m/s (AP-T)
985 m/s (HEI and TP)
Feed system Open-link M12 belt

The M621 is a 20 mm automatic cannon of French design, developed by GIAT Industries (currently Nexter) as on-board armament for armoured vehicles, aircraft, helicopters and small coastal vessels of the French Navy.