Page "Sontaran" Paragraph 15
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In The Sontaran Experiment, Field Major Styre instead used a small red laser pistol which only killed ( although it did not kill the Doctor, because of a small metal plate the Doctor had been keeping in his inside pocket ).
The Invasion of Time saw Commander Stor using the small rod again, but also in episode six, a Sontaran trooper uses a short black rifle-like laser to try to burn through a lock on a door inside the TARDIS.
The Two Doctors introduced a weapon called the Meson Gun ( as named in the Jim'll Fix It Sketch, A Fix with Sontarans ), a large silver rifle with a red fuel tank in the centre which was used by Group Marshal Stike and Varl in the third episode.
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