RX-77-3 Guncannon Heavy Custom

Model number: RX-77-3
Code name: Guncannon Heavy Custom
Unit type: prototype artillery mobile suit
Manufacturer: Earth Federation Forces
Operator: Earth Federation Forces
First deployment: UC 0079
Accommodation: pilot only, in standard cockpit in torso
Dimensions: overall height 18.1 meters; head height 17.5 meters
Weight: empty 58.6 metric tons; max gross 79.1 metric tons
Armor materials: Luna Titanium alloy
Powerplant: Minovsky type ultracompact fusion reactor, output rated at 1,380 kW
Propulsion: rocket thrusters: 62,200 kg total
Performance: maximum ground running speed 69 km/h
Equipment and design features: sensors, range 6,000 meters
Fixed armaments: 240mm cannon, mounted on backpack over shoulders; 2 x vulcan gun, mounted in head
Optional hand armaments: beam rifle, powered by rechargeable energy cap; grenades, stored in optional grenade rack on left hip armor

As development continued on the RGC-80 GM Cannon during the last weeks of the One Year War, Earth Federation Forces engineers continued tinkering with the design of the RX-77-2 Guncannon, refining it to be a standalone combat unit rather than simply a fire support mobile suit. One reincarnation of the Guncannon was the test model RX-77-3 Guncannon Heavy Custom. Although essentially little more than a retooled Guncannon, the Heavy Custom was considered a success, featuring better armor, improved 240mm cannons, and a grenade rack on its left hip armor. A Type D variant with a different weapons loadout was also created. The Heavy Custom remained in use as late as UC 0087.

First appearance: MSV
Original mechanical designer(s): Kunio Okawara (MSV and Zeta Gundam versions), Mika Akitaka (Silver Phantom version)

Rear view (Version 1)