The XXXG-01H2 Gundam Heavyarms Custom (aka Heavyarms Kai or Gundam Zero-Three) is the upgraded form of the XXG-01H Gundam Heavyarms introduced in the OVA and movie New Mobile Report Gundam Wing: Endless Waltz. It is piloted by a young man operating under the pseudonym Trowa Barton.

An upgrade of the Heavyarms to make it worthy for space combat. Besides a new dark blue-green color scheme, the Heavyarms Custom also sports two more chest gatling guns, and uses a pair of double gatling guns as its main weapon. In the Glory of the Losers manga, thrusters are added to the central part of the backpack and the rear skirt armor.

Vulcan Gun

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A pair of shell-firing armament built into the head. Low offensive power, only used to restrict enemy movement, and lay down a wall of suppressive fire due to their rapid fire capability.
Machine Cannon
Mounted on the clavicle section of the Heavyarms, the pair of machine cannons have stronger firepower than the vulcan guns.

Chest Gatling Gun

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Two pairs of gatling guns mounted in both sides of the chest, they are hidden by openable armor covers. They can be fired together with the machine cannons and vulcan guns to restrict enemy units from closing in.

Homing Missile

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Forty-four homing missiles are stored in the front skirts and leg missile pods, they are fired towards an enemy/enemies with a lock on.

Micro Missile

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The Heavyarms Custom has fifty-two micro missiles and they are stored in the shoulders and the side skirts.

Double Gatling Gun

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A pair of handheld gatling guns with two sets of barrels are the main armament of the Heavyarms Custom. Unlike the original Heavyarms, the optional shield is eliminated and the gatling guns seem to fire physical rounds, but there are claims that they can also fire beams.

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