Sontaran blaster

Sontaran heavy duty laser rifles were a form of energy weapon.

The rifles were used to great effect in the Sontaran invasion of Earth in 2008 and proved a great weapon against UNIT. They fired a red energy burst that could kill a Human with a single direct hit without leaving any signs of exterior damage. (DW: The Sontaran Stratagem / The Poison Sky)

Commander Kaagh

carried a more compact version of the blaster with the same look but was different because it's bolts were thicke r(this does not necessarily mean that it was more powerful). This gun also had a stunning setting as shown when Kaagh shot Sarah Jane without killing or injuring her. Kaagh was forced to give it up to Sarah Jane Smith after his defeat on Earth. It now lies in her attic. (SJA: The Last Sontaran)

Kaagh created a new gun that looked like his old one but could disintegrate a Bane (and by proxy a Human) with one shot. It was destroyed when Kaagh jumped into a wormhole.(SJA: Enemy of the Bane)

Clyde Langer later made a painting that featured Sontaran blasters that was displayed in the London International Art Museum. Mona Lisa used her powers to make the blaster real and she used it as a weapon. (SJA: Mona Lisa's Revenge)

It could also be used as a sniper rifle as shown when a Sontaran tried to kill Martha Jones and Mickey Smith when they were looking for him. (DW: The End of Time)

Both Stike and Varl carried them. (DW: The Two Doctors)

Turner also carried one. Although it was called a Meson Gun. (A Fix with Sontarans)