Revolver

A revolver was a type of gun.

Brigadier Alistair Gordon Lethbridge-Stewart wielded a revolver. (TV: The Ambassadors of Death, The Mind of Evil, Planet of the Spiders, Battlefield)

Prison governor George Trenchard used his old service revolver, which he kept in his desk drawer, to fight back against the Sea Devils when they attacked the prison on Fortress Island where was incarcerated. He shot dead two Sea Devils before being killed. (TV: The Sea Devils).

Jack Harkness wielded a revolver. (TV: Utopia, Journey's End)

In River Song's World, Holy Roman Emperor Winston Churchill carried a revolver while speaking with his soothsayer, the Eleventh Doctor, at Buckingham Palace. The Doctor noted this after feeling the sensation of having been running while having no recollection of doing so, and Churchill justified himself by claiming that the Doctor was "dangerous company". Later, Churchill found that he had fired his revolver when he smelt the gunsmoke, with the Doctor soon realising that they had both been engaged in a confrontation with the memory-proof Silents. (TV: The Wedding of River Song)

The Eleventh Doctor needed to be healed by an external force after he was shot in the head with an 18th century revolver. (PROSE: Dead of Winter)