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Rudra :
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20 M 621 20-mm helicopter cannon
The Nexter 20 M 621 is a single-barrelled, 20 mm cannon, which can be adapted for either left- or right-hand flat feed. It uses 20 mm M50 type (HE, AP, HI) electrically primed ammunition that is interchangeable with the US M56 rounds used for the M61A1 Vulcan. The cannon is 2.2 m long, 203 mm wide and weighs 49 kg. Its rate of fire is selectable between 300 and 740 rds/min or single round. The average recoil force is 400 kg, but with a muzzle brake in place of a flash eliminator, and using a shock-absorbing mount, recoil is reduced to 250 kg. The 20 M 621 has a muzzle velocity of 1,030 m/s when using HE/HI and 1,000 m/s when using AP. The barrel has a life of 8,000 rounds and the cannon life is 16,000 rounds. The gun fires international standard 20 × 102 ammunition. The HE explosive ammunition round, with optional tracer, weighs 100 g. It contains a charge of hexal and its auto-destruction fuze has built-in delayed arming and storage safety devices. The round explodes into about 40 splinters, which will penetrate 40 mm of hard wood at a distance of 1.5 m from the initial point of explosion. The AP hard core armour-piercing tracer round weighs 110 g, and is designed to be used against light armoured vehicles at ranges up to 800 m, being capable of piercing 25 mm of armoured plate. The HI incendiary round, which is fitted with a simple percussion
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20 M 621 20-mm helicopter cannon
The Nexter 20 M 621 is a single-barrelled, 20 mm cannon, which can be adapted for either left- or right-hand flat feed. It uses 20 mm M50 type (HE, AP, HI) electrically primed ammunition that is interchangeable with the US M56 rounds used for the M61A1 Vulcan. The cannon is 2.2 m long, 203 mm wide and weighs 49 kg. Its rate of fire is selectable between 300 and 740 rds/min or single round. The average recoil force is 400 kg, but with a muzzle brake in place of a flash eliminator, and using a shock-absorbing mount, recoil is reduced to 250 kg. The 20 M 621 has a muzzle velocity of 1,030 m/s when using HE/HI and 1,000 m/s when using AP. The barrel has a life of 8,000 rounds and the cannon life is 16,000 rounds. The gun fires international standard 20 × 102 ammunition. The HE explosive ammunition round, with optional tracer, weighs 100 g. It contains a charge of hexal and its auto-destruction fuze has built-in delayed arming and storage safety devices. The round explodes into about 40 splinters, which will penetrate 40 mm of hard wood at a distance of 1.5 m from the initial point of explosion. The AP hard core armour-piercing tracer round weighs 110 g, and is designed to be used against light armoured vehicles at ranges up to 800 m, being capable of piercing 25 mm of armoured plate. The HI incendiary round, which is fitted with a simple percussion
