Technology & Combat Characteristics
The RGM-89ST-2 ST-Gun is a variant of the RGM-89 Jegan designed specifically for the purpose of performing reconnaissance. For this purpose its frame incorporates a number of various sensor equipment such as enhanced radar and enlarged cameras, giving the ST-Gun one of the largest sensor ranges of any mobile suit.
As a reconnaissance mobile suit the ST-Gun is not particularly suited to combat. Most of the Jegan's standard armaments have been removed in order to make room for and conserve power for the sensors. The one exception is the pair of three tube rocket grenade launchers mounted on the waist. Because of this lack of weaponry it is vital that the ST-Gun move with a protective escort when in hostile territory.
One ST-Gun was part of the Federation's 13th independent mobile corps when it was assigned to travel to Mars to combat the Oldsmobile Army. After the Mars Zeon ambush in space the ST-Gun, piloted by Navi, was one of the few survivors to make it to the surface along with a modified AMS-119 Geara Doga piloted by Sid Amber and the F90 Gundam Formula 90 piloted by Def Stallion. The three would combat the Mars Zeon ground forces however in the first battle the ST-Gun would be heavily damage, rendering it unable to move. This allowed Mars Zeon forces to capture the ST-Gun. Navi would be rescued but the ST-Gun would be lost when the base was destroyed.