Clara destroys a Cyberman.
An anti-cyber gun was a weapon designed by humans to battle the Cybermen. The punishment platoon led by Alice Ferrin used one found on Hedgewick's World of Wonders. When fired, the gun produced a red beam which disintegrated Cybermen into thin air. The gun only had a number of shots before it needed to recharge. Eventually, the Cybermen installed an upgrade which rendered the gun useless. (TV: Nightmare in Silver)