The AK-47 is a selective-fire, gas-operated 7.62×39mm assault rifle. All current model AK-47 rifles can mount under-barrel 40 mm grenade launchers such as the GP-25, GP-30 & GP-34, which can fire up to 20 rounds per minute and have an effective range of up to 400 metres. The main grenade is the VOG-25 (VOG-25M) fragmentation grenade which has a 6 m (9 m) (20 ft (30 ft)) lethality radius. The VOG-25P/VOG-25PM ("jumping") variant explodes 0.5–1 metre (1.6–3.3 ft) above the ground. The standard AK-47 or AKM fires the 7.62×39mm cartridge with a muzzle velocity of 715 m/s (2,350 ft/s). The cartridge weight is 16.3 g (0.6 oz), the projectile weight is 7.9 g (122 gr).