The Gundam Heavyarms was created by resistance fighters at the L3 colony cluster. Designed for long-range attacks, this Gundam is packed with guns and missiles from head to foot. The Heavyarms's primary weapon is the lethal beam gatling worn over its left hand, supplemented by homing missiles in its shoulders, micro missiles on its legs, and gatling guns concealed inside its chest. When it's exhausted its ammunition, the Heavyarms must fall back on the small knife mounted on its right forearm

The Gundam Heavyarms, one of the five Gundams created for Operation Meteor, was a walking arsenal of machine guns, gatlings, and missiles, capable of delivering devastating firepower at any range. It was eventually upgraded for space combat, and the remodeled Heavyarms Custom was outfitted with a pair of hand-held double-barreled gatling guns. Though it lacks melee weapons, the combat skills of pilot Trowa Barton make the Heavyarms Custom a lethal opponent even in close combat