Cartridge Trap is also known as the Foot Breaker. The Cartridge Trap consists of a cartridge set into a piece of bamboo fastened to a board and installed in a camoflaged pit. A nail driven through the bottom of the bamboo serves as a firing pin. The weight of a man stepping on the upper end of the cartridge forces the nail into the cartridge to initiate the primer; the bullet is then propelled upward through the man’s foot. See accompanying picture.