Designed for fire support, the Gunbluster's most distinctive feature is the array of twenty-two cannons built into its back. These weapons are designed to be fired as one mass assault, allowing the Gunbluster to wipe out most anything that it faces. The Zoid is strong on defense as it is offense, being equipped with thick armour and a powerful omni-directional energy shield built into the twenty-four spikes along the side of its body. In addition to protecting the Zoid from weapons fire, the shield also provides protection against Electronic Warfare and jamming.
While slow and bulky, the Gunbluster is surprisingly agile and able to traverse difficult terrain. In addition to its massive array, Gunbluster can use electro-magnetically charged teeth and its horn when forced into close quarters combat.
The design was not destroyed in the meteor shower of ZAC 2056, and the Republic rebuilt the Gunbluster prior to the ZAC 2101 invasion of the Dark Continent. Gunbluster also showed to rescue the Flash Division from Berserk Führer and Grounchar's attacks, using its cannons to break down the Berserk Führer's shield and drive it back.
The Gunbluster kit comes on five frames, along with a battery powered motor, four gears, fourteen rubber caps, a pilot figure, a cover for one of the gears, a rectangular spacer to support the motor, and a label sheet. The Gunbluster is moulded in dark blue, white, light silvery grey, and chrome gold.
The Gunbluster's assembly is not overly complex, with the most difficult part being the assembly of the weapons and the gears that cause them to rotate. When activated, the Zoid also walks forward, opening and closing its mouth while the weapon barrels spin. The motor is powered by a single "AA" battery.
The Gunbluster was first released in July 1989. The Zoid is similar in design and appearance to other Grade Ups Zoids, but does not possess a Grade Up connector port.
Several other versions of the Gunbluster have been released. These are detailed below.
The Zoid was also re-released in Australia as a part of the New Pacific Release.