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The firing of a bullet is caused by a chemical reaction which occurs when the powder contained within the cartridge ignites, causing the formation of gases which expand and push the projectile out of the casing and down the barrel. This reaction is started when either the rim or the primer of the cartridge is struck by either a hammer, striker, or firing pin (depending on what action the firearm has). The hammer or striker is set into motion by a spring which is compressed until a sear is moved to release the hammer or striker (a hammer may either contact the primer directly, or it may hit a firing pin, which in turn hits the primer). And the sear is released by pulling on the trigger.

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Q: What is the name of the part of the gun that fires the bullet?
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