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Sigma KEE - GatlingGun
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The Gatling gun was the first highly successful rapid-repeating firearm. It was the first firearm to combine reliability, high firing rate and ease of loading into a single device. It was designed by the American inventor Richard J. Gatling, in 1861 and patented on May 9, 1862. In modern usage it typically refers to guns with a similar rotating barrel design. Depending on how one defines the term, the Gatling gun is not the first machine gun, despite frequent references to it as such, machine guns operate entirely on a fraction of the power of the fired cartridge, while the Gatling relies on external power (hand crank, or electric/hydraulic motor). (from Wikipedia)
Parents AutomaticGun A Gun that fires a burst of Projectiles with each pull of the trigger. Also known as a machine gun.
Children GAU12UThe five-barrel 'Equalizer' cannon was developed in the late 1970s, based on the mechanism of the GAU-8/A Avenger cannon, but firing a new NATO series of 25 mm ammunition. The GAU-12U cannon is operated by a 15 hp (11 kW) electric motor, in external mounts supplied by a bleed air-drive pneumatic system. Its rate of fire is normally 3,600 rounds per minute, with a maximum of 4,200 rounds per minute. The Equalizer normally uses PGU-20/U armor-piercing incendiary (API) or PGU-22 or PGU-25 high-explosive incendiary (HEI) ammunition. With a harder-hitting projectile and comparable muzzle velocity, it is more lethal than the older M61 Vulcan, and more effective than the older 30 mm ADEN cannon it replaces. (from Wikipedia)
 M197GatlingGunThe M197 electric cannon is a three-barreled electric Gatling gun developed primarily for use by United States Army helicopter gunships. Development of the M197 began in 1967 after experience in the Vietnam War revealed the inadequacy of the 7.62 mm Minigun for gunship use. The M197 is essentially a lightened version of the General Electric M61 Vulcan cannon, with three barrels instead of six. Its maximum rate of fire is one quarter that of the Vulcan, largely to limit its recoil for light aircraft and helicopter use. It shares the Vulcan's M50 and PGU series 20 mm ammunition. The M197 went into service on later marks of the AH-1 Cobra, and was also fitted in a ventral turret on the U.S. Marine Corps OV-10D Bronco. It is also the basis of the GPU-2 gun pod, which incorporates the cannon, a battery and electric drive motor, and 300 rounds of linkless ammunition. In the Cobra, the weapon is supplied with a magazine of 700 linked rounds. It has a cyclic rate of fire of 730 rounds per minute (plus or minus 50 rounds). Standard practice is to fire the cannon in 100-round bursts, allowing several minutes of cooling time between bursts. The M197 remains in use in the latest AH-1W and AH-1Z Cobra gunships. Although the weapon's rotary drive is theoretically quite reliable, its ammunition feed has been anything but: Marine pilots report an alarmingly high jam rate (sometimes greater than 30%). The USMC and the manufacturer are aware of the problem, but no specific fix has been incorporated on the AH-1Z. In the meantime, crews have been trained in techniques intended to minimize the risk of jamming. (from Wikipedia)

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