Because of its low priced and great reliability the troop carrier M113 presented itself as a valid base for various anti-tank weapons systems like TOW missiles or an anti-aircraft weapon similar to this variation. The M163 originated around a 20 mm weapon Vulcan. Rotating barrels (with a rapid fire power of 6000 rounds each and every minute) were designed for anti-aircraft use. The complete system is founded on a straightforward
