Energy blaster

The Energy blasters were created by The Preachers on Pete's World to kill the Cybermen. They could easily blow off the head of a Cyberman.

The Doctor enhanced some blasters to penetrate the heat shields and Polycarbide of a Dalek. The blasters had temporarily disabled the Cult of Skaro's weapons, though the Daleks quickly adapted to the new weaponry and quickly regained control over their weapons. (DW: Doomsday)

Upgraded versions of these guns were developed some time later, and used by Rose Tyler, Jackie Tyler and Mickey Smith. The upgraded blaster could easily destroy a Dalek. (DW: The Stolen Earth/ Journey's End)