M621
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| Weight: | 45.5-kilogrammes |
| Length: | 2.207-metres |
| Width: | 202-millimetres |
| Height: | 245-millimetres |
| Cartridge: | 20x102-millimetre |
| Caliber: | 20-millimetre |
| Action | Blowback Operated |
| Rate of fire: | 800-rounds/minute |
| Muzzle velocity: | 1,005-metres/second (AP-T) |
| 985-metres/second (HEI and TP) | |
| Feed system: | Open-link M12 belt |