Radiaton launchers

The Radiation Launcher was a missile weapon used by the IG-100 Magnaguards during the Clone Wars. It was a shotgun-like rifle, and fired a single shell which contained a small radiation charge. When the charge impacted on the ground, walls or targets, the charge poisoned an area about 2 metres from the impact point with radiation. The weapon was effective in stopping closely huddled groups of clones, but it could not kill tehm all with a single shot, therefore, its inability to rapid fire made the weapon less effective. Although the weapon was not that strong against multiple targets, a direct hit could instantly kill any trooper.

Sources: Star Wars: Battlefront II