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In page Percussion cap:

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Caps are used in cartridges, grenades, rocket-propelled grenades and rescue flares. Percussion caps are also used in land mine fuzes, booby-trap firing devices and anti-handling devices. Most purpose-made military booby-trap firing devices contain some form of spring-loaded firing pin designed to strike a percussion cap connected to a detonator at one end. The detonator is inserted into an explosive charge—e.g., C-4 or a block of TNT. Triggering the booby-trap (e.g., by pulling on a trip-wire) releases the cocked firing pin that flips forward to strike the percussion cap, firing it and the attached detonator; the shock-wave from the detonator sets off the main explosive charge.[citation needed]