Toy cap gun revolver is a toy gun that creates a loud sound simulating a gunshot and smoke when a small percussion cap is ignited. Toy cap gun revolver were originally made of cast iron, but after World War II were made of zinc alloy, and most newer models are made of plastic.
This is the get their name from the small discs of shock-sensitive explosive compounds (roughly 1.4 to 1.6 millimetres (0.055 to 0.063 in) in diameter) . That provide the noise and smoke, effectively the same as the Maynard tape primer and percussion. Caps used in real firearms of the mid to late 1800s but usually smaller and made from cheap plastic or paper.