The Zaku Cannon was developed out of the Zeon's MS-06J-12 Project, which was to build an anti-aircraft mobile suit. The project was change to include mid-range support capabilities following the appearance of the Earth Federation Forces' mid-range fire support RX-77-2 Guncannon. This modified unit, without the shield on the right shoulder and equipped with the same backpack that also equips the MS-09K-1 Dom Cannon, is used as a semi-fixed artillery position. Its main armament is a Long Cannon on the right side of the backpack, this artillery cannon is for mid-long range fire support. It is also equipped with an 8 tube smoke discharger on the right side.
