Model number: RX-77-3
Code name: Guncannon Heavy Arms Type
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
Powerplant: Minovsky type ultracompact fusion reactor, output rated at 1380 kW
Propulsion: rocket thrusters: 62200 kg total
Performance: maximum thruster acceleration 0.79 G; maximum ground running speed 69 km/h
Equipment and design features: sensors, range 6000 meters
Fixed armaments: 240mm cannon, mounted on backpack over shoulders; 2 x 60mm vulcan gun, fire-linked, mounted in head
Optional hand armaments: beam rifle, powered by rechargeable energy cap; grenades, stored in optional grenade rack on left hip armor

Technical and Historical Notes

As development continued on the RGC-80 GM Cannon during the last weeks of the One Year War, Federation engineers continued tinkering with the design of the RX-77-2 Guncannon, refining it to be a stand-alone combat unit rather than simply a fire support mobile suit. One reincarnation of the Guncannon was the test-model RX-77-3 Guncannon Heavy Arms Type. Although essentially little more than a retooled Guncannon, the Heavy Arms Type was considered a success, featuring better armor, improved 240mm cannons, and a grenade rack on its left hip armor.

Miscellaneous Information

Appearances: MSV (Mobile Suit Variations); Mobile Suit Zeta Gundam; Mobile Suit Zeta Gundam (manga)
Original mechanical designer: Kunio Okawara