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The RX-77-3D Guncannon Heavy Type D is a variant of the RX-77-3 Guncannon Heavy Custom first featured in the original design series MSV-R.

Technology & Combat Characteristics

Although the RX-77-3 Guncannon Heavy Custom is an improvement over the RX-77-2 Guncannon, with lower recoil when firing the cannons and better weapons as well as armor capabilities, though its mobility still left much to be desired. To address this issue, one of the Guncannon Heavy Customs was improved into the RX-77-3D Guncannon Heavy Type D upon orders from the Earth Federation Forces. The Guncannon Heavy Type D has additional vernier thrusters on its backpack and legs to improve mobility[1] [2]. It also has additional armor on its head and shoulders [3]. Thanks to the four new leg thrusters, the increase in weight caused by this added armor does not affect the suit's mobility. Interestingly, the Guncannon Heavy Type D reverts to the knee armor of the original Guncannon.

With its enhanced mobility, the Guncannon Heavy Type D's combat range also widens. Thus, although a mid-range support unit, it can also function as a general-purpose unit with performance close to that of a melee combat machine[1]. Armament wise, it has similar weapons as the original Guncannon and Guncannon Heavy Custom. After the first Guncannon Heavy Type D unit displayed high performance during tests, the suit was formally adopted by the Earth Federation Forces. However, due to its high cost and the completion of the superior RX-77-4 Guncannon II soon after, the Guncannon Heavy Type D was produced only in limited numbers[1][3].


  • 60mm Vulcan Gun
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.
  • 240mm Cannon
A pair of shoulder-mounted 240mm cannons served as the Guncannon Heavy Type D's main weapon. Like the ones used by the Guncannon Heavy Custom, the Guncannon Heavy Type D's cannons have a higher rate of fire, better ammunition feed system and cause less recoil when fired than those of the RX-77-2 Guncannon.
  • XBR-M-79a Beam Rifle
The Guncannon Heavy Type D can use the same beam rifle as the RX-77-2 Guncannon. This particular beam rifle is specialized for sniping. Compared to the beam rifle used by the RX-78-2 Gundam, it was harder to use but had higher accuracy and longer range. It is said to have a range of around 30km.
  • Balzac type 380mm Rocket Bazooka
An optional MS-use Bazooka developed for the GM Series, it is also often used by the RX-77 series. Besides having enhanced accuracy due to the sensor mounted on top of the weapon, it is also lightweight, easy to use and has high shooting performance.
  • RGM*S-Sh-WF/S-00109 Shield
Mounted on the forearm, this is the same defensive armament as used by the Gundam Ground Types and GM Ground Types. However, the primary purpose for the Guncannon Heavy Type D equipping this shield is to help maintain its balance while jumping whenever it carries large weaponry, such as the Balzak Type 380mm Rocket Bazooka.
  • Hand Grenade
The Guncannon Heavy Type D has an unknown number of hand grenades stored in a rack on its left side armor. Various types of hand grenades can be stored, including one known as 'Cracker', which breaks up into several smaller explosives in midair, and is also used by Zeon's mobile suit.


The Guncannon Heavy Type D was first deployed in the late stages of the One Year War, and used by the Earth Federation Ground Forces on the African front [4]. One unit was also assigned to the penal battalion Slave Wraith, and painted in their team custom colors.



  1. 1.0 1.1 1.2 Gundam Ace” July 2010 issue, Kadokawa Shoten, page 165.
  2. Mobile Suit Gundam MSV-R Graphic Document, ASCII Media Works, January 2012, pages 62-63.
  3. 3.0 3.1 PlayStation 3 game Mobile Suit Gundam Side Stories Limited Edition Bonus Book "MOBILE SUIT GUNDAM SIDE STORY MISSING LINK ARCHIVES" page 21.
  4. Kunio Okawara and Kenichi Kusakari "Mobile Suit Gundam MSV-R Federation Edition", Kadokawa Shoten, March 2012, pages 64-65.

External links

MSV-R Mechanics
Earth Federation
Mobile Weapon
Full Armor Gundam's variations
FA-78-1B Full Armor Gundam Type B | FA-78(G) Full Armor Gundam Ground Type
Heavy Gundam's variation
FA-78-2 Heavy Gundam (Unit 2)
GM Cannon's variations
RGC-80-1 GM Cannon Test Type | RGC-80S GM Cannon Space Assault Type
GM Sniper Custom's variations
RGM-79HC GM Guard Custom | RGM-79KC GM Interceptor Custom | RGM-79SC GM Sniper Custom (Shimoda Squad Type)
GM's variations
RGM-79LV GM Night Seeker II | RGM-79U GM Sloep | RGM-79V GM Night Seeker
Guntank's variation
RMV-3M Local Control Type Guntank
Guncannon's variation
RX-77-3D Guncannon Heavy Arms Type D
Gundam's variation
RX-78-2 Gundam Real Type | RX-78SP Gunner Gundam
Ball's variations
RB-79F Ball Type F | RB-79M Ball Type M

Aircraft / Spacecraft
FF-S5 Raven Sword | FF-X5 Prototype Core Fighter | FF-X7BstPLAN004 Core Booster Plan004 | G-Fighter Assault Landing Type | G-Fighter Bomber Type | G-Fighter Space Type
Transporter / Supply Ship
CB-X5(SGT) Assault Type Gunperry
Cruiser / Mother Ship
SCV-102 Nelson
Principality of Zeon
Mobile Weapon
Agg's variation
EMS-05F Azock
Zaku I's variation
MS-05Q Zaku I (Norris Custom)
Zaku II's variations
MS-06A Zaku II First Mass Production Type | MS-06FS Zaku II | MS-06R-1A Zaku II High Mobility Type | MS-06S Zaku II Commander Type
Zaku II Ground Type's variations
MS-06D Zaku Desert Type | MS-06G Zaku II High Mobility Ground Type | MS-06GR Zaku II High Mobility Ground Type Kai | MS-06JK Zaku Half Cannon | MS-06K Zaku Cannon (Gatling Gun Equipment Type) | MS-06V-8 Zaku Tank (Wild Boar)
Gouf's variations
MS-07G-1 Gouf Vijayanta | MS-07G-2 Gouf Tactical Assault Type | MS-07W Gouf Combined Test Type
Dom's variations
MS-09 Dom Cold Climate Type | MS-09M Dom Mermaid | MS-09R Rick Dom Dozle Zabi Custom | YMS-09J Dom High Speed Experimental Type
Gelgoog's variations
MS-14B Gelgoog Uma Lightning Custom | MS-14BR Gelgoog High Mobility R type | MS-14C-1A Gelgoog Cannon | MS-14GD Gelgoog G
Z'Gok's variation
MSM-07N Ram Z’Gok
Gyan's variation
YMS-15E Gyan Eos
Bigro's variation
MA-05R Big Ruf
Grublo's variation
MAM-07-X3 Grublo Underwater Bit-Mounted Prototype
Zakrello's variation
MAN-00X-2 Brawrello
MSM-06 Jurick

Aircraft / Spacecraft
Dodai GA | G87 Luna Tank | Gobble
Cruiser / Mother Ship
CCM-91 Chimaira | Gagaul-class