The XXXG-01H Gundam Heavyarms (aka Heavyarms) was the third of Operation Meteor's five Gundams. Created by Doktor S while hiding in the L3 colony cluster, it was designed with maximum firepower in mind. Literally a walking arsenal, Gundam Heavyarms was piloted by a young man operating under the pseudonym Trowa Barton.
Developed by Gundam Scientist Doktor S, the Heavyarms was developed in the L3 Colonies under the financial support of the Barton Foundation. The design Concept of the Heavyarms was for it to have an extraordinary amount of guns: a heavy fire role. In the case that the Heavyarms uses up all its ammo, it features a retractable army knife on its right arm to engage enemies in close combat. When Heero Yuy borrowed the Heavyarms to engage in a duel with Zechs Merquise in his Tallgeese, the Heavyarms was refitted to mount a fixed beam saber under the Beam Gatling. When its beam gatling is not in use, it can be stored on the backpack.