A Metal Storm gun of any size -- from a 9mm handgun up to a machine gun size or a grenade launcher -- has no moving parts other than the bullets or munition inside the barrel. Rather than chambering a single slug for each shot - very quickly in the case of machine guns -- the bullets come pre-stacked inside the barrel and can be shot all at once, or one at a time, as the shooter decides through the electronic controls.
Because there are no moving parts, the weapon is less likely to jam, and will presumably need less maintenance.
Lashing many barrels together dramatically increases the number of rounds fired per second. Once fired, however, each spent barrel has to be reloaded.
Its 40mm answer to the MK19 - the current automatic grenade launcher in use by the U.S. military - chambers up to 15 rounds in the barrel at once. They can be squeezed off one at a time or fired almost simultaneously. According to the company, this gives the Metal Storm gun 4,000 times the rounds-on-target capability of the MK19, which has a rapid fire rate of 60 rounds per second.
Starting in 2006 the company will demonstrate its prototypes with applicability that is especially likely to interest the U.S. military. The grenade launching weapon system can be mounted on an unmanned ground combat vehicle, an unmanned aerial vehicle, and might be used as a defense against rocket-propelled grenades and mortars.
Metal Storm's speed allows it to lay down a blinding wall of slugs that can intercept and pulverize incoming enemy fire, according to company CEO David Smith. As long as the grenade or mortar is fired from outside a range of about 50 meters or 162.5 feet and a Doppler radar is in use, a Metal Storm system could be an effective defense, he told UPI.
Closer than that and there is just not time to react.
"But if you are from 50 meters and beyond, if everything can work fast enough -- the radar -- there is enough time mathematically" to shoot down incoming fire, Smith said.
At least 153 U.S. troops have been killed in Iraq by enemy rockets and mortars since the start of the war. Nearly 2,000 have been wounded.
The grenade launcher barrel can also carry less-than-lethal munitions, like small bean- bags, sponge grenades or smoke. On Jan. 16, the Army awarded Metal Storm a $975,000 contract to further develop its non-lethal rounds.
"Our so-called competition is (the) Mk19 - grenade machine gun," Smith said. "It's enormously heavy. It takes six people to carry it into a battlefield scene. It's not mobile.
"But the military has had this transition out of big system warfighting into much lighter, higher firepower that can be carried into battle by individuals or light vehicles. Our guns have no moving parts -- so they have the same amount of fire power at significantly reduced weight ratio."
Metal Storm technology has been under development for about a decade, but a series of small-business innovative research contracts awarded recently by the Department of Energy and the Army means prototypes are now being produced and demonstrated.
"We are to the point we can start providing prototypes. The Army is very, very parochial in how they buy weapon systems," Smith said. "But now we can put it into an actual environment."
The company is also studying whether it can mount a Metal Storm weapon on a small unmanned helicopter, particularly looking at the recoil effect from the gun.
Smith said such a system - deployable down to the squad level -- could be useful in a place like Iraq, where it's a common tactic for insurgents to launch a mortar and then run. By the time soldiers on foot or in a vehicle get to the launch site, the shooters are long gone. But a UAV quickly launched can see where the shooters run to, and if a gun is on board, can shoot at them.
The Australian military is testing a Metal Storm gun of its own, the Advanced Individual Combat Weapon (AICW). The AICW combines both an assault rifle and a 40 mm grenade launcher in a single unit with a common trigger, allowing the shooter to choose which munition he wants to fire without having to refit his weapon. It also allows three grenades to be fired at once, whereas one is the only option in the current generation of weapons.
Metal Storm Inc. will demonstrate a high-explosive munition with a 10-meter (32.5 feet) burst radius in Singapore on Feb. 6, Smith said, and for the Army's Picatinny Arsenal and Armament Research, Development and Engineering Center later that month.