M621 cannon

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M621
Type Automatic cannon
Place of origin  France
Production history
Designer GIAT Industries
Manufacturer GIAT Industries (currently Nexter)
Specifications
Weight 45.5 kg (100.31 lb)
Length 2,207 mm (86.9 in)
Width 202 mm (8.0 in) (in mount)
Height 245 mm (9.6 in) (in mount)

Cartridge 20x102mm
Action Blowback operated
Rate of fire 800 rounds/min
Muzzle velocity 1,005 m/s (3,297 ft/s) (AP-T)
985 m/s (3,231.6 ft/s) (HEI and TP)
Feed system Open-link M12 belt

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