A middle-range support mobile suit developed simultaneously with the RX-78 Gundam and the RX-75 Guntank as part of Operation V. Due to its role as an artillery support unit, the Guncannon's design prioritized durability over mobility and it was not equipped with any melee weapons. Similar to the Guntank, the Guncannon's main weapons were a pair of shell-firing cannons, chosen for their reliability over beam weapons. These cannons could be optionally swapped out for a pair of spray missile launchers. Unlike the Guntank, however, the Guncannon's generator output allowed it to equip a beam rifle. It was also equipped with a pair of head-mounted vulcan guns, hand grenades for attacking enemy strongholds and a chest gun.