The RGM-122 Javelin was a successor unit to the earlier Jamesgun mobile suit. Featuring two shot-lancers inspired by those used by the crossbone vanguard, and possessing high-mobility, the Javelin was a distinct upgrade to the Jamesgun. However by the time of the Zanscare invasion, the Javelin was already a aged unit and was outclassed by many of the Zancare's mobile suits.
