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Firearms that are fired repeatedly and quickly can become very hot from the burning of gunpowder in the cartridges. If an unfired cartridge is chambered, the heat of the chamber can cause the gunpowder in the cartridge to ignite, without the primer being struck. This is known as a "cook off". Fully automatic weapons, such as the M-60 machine gun, fire from the "open bolt" mode- when the trigger is pulled, the bolt moves forward, picking up a cartridge, chambering it, and immediately firing it. This provides for greater cooling, and prevents having a loading cartridge sitting in a hot chamber. Older designs, such as the AK-47, fire from a closed bolt mode, and when fired repeatedly may be prone to a "cook off".

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Q: Guns fire automatically when its hot-why?
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