Sontaran blaster

Sontaran heavy duty laser rifles were a form of energy weapon used by the Sontarans. They were powered by Cobalt Blue. (AUDIO: Old Soldiers)

History
Commander Stark and his aides carried rifles when the Sontarans formed an Alliance to trap the Eleventh Doctor in the Pandorica in 102. (TV: The Pandorica Opens) Like their wielders, these rifles were reduced to stone and dust following the Total Event Collapse, but were later restored. (TV: The Big Bang)

Beneath the storm drains of London in 1605, an army of Sontarans patrolled with Sontaran blasters while searching for a Rutan ship containing doomsday weapons targeted at Sontarans. When the Houses of Parliament was taken into Earth orbit with the Rutan doomsday weapons inside, they killed many Rutans inside Parliament with these blasters. (GAME: The Gunpowder Plot)

Both Stike and Varl carried Sontaran blasters while in 1980s Spain. (TV: The Two Doctors)

The rifles were used to great effect in the Sontaran invasion of Earth in 2009 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. (TV: The Sontaran Stratagem / The Poison Sky)

Commander Kaagh carried a submachine blaster, it was different than the other conventional blasters because of the size and was more compact. This gun also had a stunning setting as shown when Kaagh shot Sarah Jane Smith without killing or injuring her. Kaagh was forced to give it up to Sarah Jane after his defeat on Earth. It now lies in her attic. (TV: The Last Sontaran)

Kaagh created a new gun that looked identical to his original one but could now disintegrate an organic target with one shot. It was supposedly destroyed when Kaagh jumped into a wormhole. (TV: Enemy of the Bane)

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

It could also be used as a sniper rifle. Jask attempted to kill Martha Jones and Mickey Smith when they were searching for him. The Tenth Doctor hit Jask's probic vent before he could do so, knocking him out. (TV: The End of Time)

Commander Strax, despite being demoted to Nurse, still carried a blaster. He used it against the Headless monks on Demons Run in the 52nd century. (TV: A Good Man Goes to War)