M621 cannon

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.

M621
Type	Automatic cannon
Place of origin	France
Production history
Designer	GIAT Industries
Manufacturer	Nexter Systems
Variants	see variants
Specifications
Mass	45.5 kg (100.31 lb)
Length	2,207 mm (86.9 in)
Barrel length	1,460 mm (57 in)
Width	202 mm (8.0 in) (in mount)
Height	245 mm (9.6 in) (in mount)
Cartridge	20×102mm
Caliber	20mm
Action	Gas operated, delayed blowback
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

Variants

THL 20

Turreted cannon for helicopters.^[1]

POD NC 621

Cannon pod for helicopters and light aircraft.^[2]

ARX 20

Remotely controlled weapon station with M621 and a 7.62×51mm machinegun.

SH20

Door mounted cannon for helicopters.^[3]

CP 20

Pintle-mounted cannon for vehicles and boats.^[4]

15A

Cannon for naval ships.^[5]

NARWHAL

As remote-controlled naval gun on the Nexter Narwhal 20A.^[6]

See also

• GIAT 30
• 20 mm modèle F2 gun
• M197 electric cannon