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The MS-04 Prototype Zaku is a mobile suit featured in Kunio Okawara's M-MSV original design series and the Developers: Mobile Suit Gundam Before One Year War manga.

Technology & Combat Characteristics

An improved version of the MS-03 prototype, equipped with a small thermonuclear reactor ZAS-X7, with mobility that is more than twice that of the MS-03. Armor is also enhanced, and finally it became an MS that could withstand actual battles.


  • 100mm Machine Gun
The main armament of the Prototype Zaku is a 100mm machine gun called the “Zaku Machine Gun”, but the results of the simulations indicate that it is less effective in anti-ship combat, and the development of the Zaku Bazooka was soon underway.


Following the introduction of the MS-03 Prototype Zaku, Zeonic Company created an advanced version of this suit which would result in the creation of the MS-04. However, because of its poor cost efficiency, development eventually led to the creation of the simplified MS-05B Zaku I.


M-MSV Mechanics
Earth Federation/Titans
Mobile Weapon
Gundam's variations
FA-78-3 Full Armor 7th Gundam | HFA-78-3 Heavy Full Armor 7th Gundam | RX-78-4 Gundam Unit 4 "G04" | RX-78-5 Gundam Unit 5 "G05" | RX-78-6 Mudrock Gundam | RX-78-7 7th Gundam
Psycho Gundam's variations
MRX-007 Prototype Psycho Gundam | MRX-011 Mass Production Type Psycho Gundam
GM's variations
RAG-79 Aqua GM | RAG-79-G1 Waterproof Gundam | RGM-79F Desert GM | RGM-79F Land Combat Type GM
Guncannon's variation
RX-77-1A Guncannon A
ν Gundam 's variation
RX-94 Mass Production Type ν Gundam
RX-81LA G-Line Light Armor | RX-81ST G-Line Standard Armor
Principality of Zeon
Mobile Weapon
Zaku II High Mobility Type's variation
MS-06R-3S High Mobility Type Zaku
Gogg's variation
MSM-03-1 Prototype Gogg
Bigro's variation
MA-05 Bigro Kai
MSM-02 Hydro Test Type | MS-04 Prototype Zaku
Mobile Weapon
Gundam Mk-III's variation
FA-007GIII Full Armor Gundam Mk-III
Hyaku Shiki Kai's variations
FA-00100S Full Armor Hyaku Shiki Kai | MSK-100S Land Combat Hyaku Shiki Kai
ZZ Gundam's variations
MSZ-009 Prototype ZZ Gundam | MSZ-009B Prototype ZZ Gundam B Type | MSZ-013 Mass Production Type ZZ Gundam
Rick Dias's variation
RX-098 Prototype Rick Dias