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RX-178B Build Gundam Mk-II

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RX-178B Build Gundam Mk-II

Build Gundam Mk-II - Front
Unit Type

Custom General-Purpose Mobile Suit



Real World

Mechanical Designer


Model Number
  • RX-178B
Developed from
  • Build Booster Mk-II
Known Pilots

General Characteristics

Overall Height
  • 18.5 meters60.696 ft
    728.346 in
Standard Weight
  • 78.6 metric tons
  • 2 x Beam Rifle Mk-II
  • 2 x Movable Shield searchgray_iconsmall.png
Special Equipments and Features
  • Build Booster Mk-II searchgray_iconsmall.png
Optional Equipment
  • Shield searchgray_iconsmall.png
  • Hyper Bazooka searchgray_iconsmall.png
  • Vulcan Pod searchgray_iconsmall.png

The RX-178B Build Gundam Mk-II is a mobile suit from the anime series Gundam Build Fighters and a variant of the RX-178 Gundam Mk-II. It is built by Sei Iori as a back-up unit, and is piloted by Reiji, then by Sei later on.

Technology & Combat Characteristics

Based on the Gundam Mk-II that appeared in Mobile Suit Zeta Gundam and Mobile Suit Gundam ZZ, Sei also takes into account the settings of the animation when designing the Build Gundam Mk-II. Its main armament are two new beam rifles, dubbed "Beam Rifle Mk-II", two beam sabers, and two movable shields, and can be optionally equipped with a hyper bazooka, a vulcan pod and MK-II's standard shield and beam rifle. The suit is also equipped with the Build Booster Mk-II support unit on the back, and it can operate as an independent fighter when separated[1].


  • Beam Rifle Mk-IIs
The Build Gundam Mk-II's primary weapon, they are high output beam rifles that are mounted to the movable shields, but they can also detach and be used as handheld weapons. Besides being fired like a normal Beam Rifle, it also has a burst mode, whereby it functions like a beam machine gun.
  • Beam Saber
Each rifle can also generate a beam blade from its emitter for close combat when mounted on the movable shield.
  • Movable Shield
The primary defensive equipment of the Build Gundam Mk-II, and also serves as the mounting point for the Beam Rifle Mk-IIs. The movable shields can be mounted either to the Build Booster MK-II or to the Build Gundam Mk-II's arms.
  • Beam Sabers
The Build Gundam Mk-II possesses two beam sabers as its primary close combat weapon. When not in use, the beam sabers are stored on a pair of racks on its backpack, identical to the original Gundam Mk-II.
  • Beam Rifle
The Build Gundam Mk-II's optional ranged beam weapon, it is the same handheld beam rifle used by the Gundam Mk-II
  • Hyper Bazooka
A powerful handheld bazooka, identical to that used by the Gundam Mk-II
  • Vulcan Pod
Just like the Gundam Mk-II, the Build Gundam Mk-II lacks head-mounted vulcan guns, but it can equip this optional vulcan pod on its head. The vulcan guns are housed in the left side with two barrels, while the right side functions as a balancer and contains the magazine.
  • Shield
The Build Gundam Mk-II can also carry the standard solid shield used by the Gundam MK-II.

Special Equipment & Features

  • Build Booster Mk-II
A support unit like GAT-X105B/FP Build Strike Gundam Full Package's Build Booster, it is armed with the Beam Rifle Mk-IIs and the Movable Shields. These two weapons can be transferred to Build Gundam Mk-II's arms when the Build Booster Mk-II docks with the suit. The front portion of the Build Booster Mk-II can detach after docking like the FXA-05D G-Defenser, and can be reattached when the unit is separated from the suit and is functioning independently.


For the history of the Build Gundam Mk-II, go to Sei Iori and Reiji's pages.




  1. "Build Gundam Mk-II" assembly instruction, 1/144 scale model HGBF, No.004, 31 October 2013

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