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[[Image:Glock30.jpg|right|200px]]

[[Image:Glock30.jpg|right|200px]]

The mostly-defensive weapon of gun fires a bullet, dart or other projectile.

A '''gun''' is a weapon that fires a bullet, dart or other projectile.

The four main types of modern firearms today are bolt-operated, pump action, semi-automatic, and automatic weapons. In a bolt-action weapon, each new [[round (ordnance)|round]] must be loaded manually, by moving the [[breech]] to eject the empty casing. In pump action guns (usually shotguns) a new round must be manually loaded by pulling back on pump of the gun, located underneath the barrel. In semi-automatic weapons, each pull of the trigger fires a bullet, each shot ejecting spent brass and loading new ammuntion until the magazine is depleted. In fully automatic weapons, bullets will be fired as long as the trigger is depressed. Fully automatic fire will cause the gun to heat up very quickly, which can become dangerous as it can burn exposed flesh and because rounds may "cook off" or fire unexpectedly due to the chamber becoming hot enough to ignite the propellant.  

The four main types of modern firearms today are bolt-operated, pump action, semi-automatic, and automatic weapons. In a bolt-action weapon, each new [[round (ordnance)|round]] must be loaded manually, by moving the [[breech]] to eject the empty casing. In pump action guns (usually shotguns) a new round must be manually loaded by pulling back on pump of the gun, located underneath the barrel. In semi-automatic weapons, each pull of the trigger fires a bullet, each shot ejecting spent brass and loading new ammuntion until the magazine is depleted. In fully automatic weapons, bullets will be fired as long as the trigger is depressed. Fully automatic fire will cause the gun to heat up very quickly, which can become dangerous as it can burn exposed flesh and because rounds may "cook off" or fire unexpectedly due to the chamber becoming hot enough to ignite the propellant.