| 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 |
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.