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A '''Gun''' is a weapon which fires a bullet, dart or other [[round (ordnance)|round]].

A '''Gun''' is a weapon which fires a bullet, dart or other projectile.

The three main types of modern firearms today are bolt-operated, semi-automatic, and automatic weapons. In a bolt-action weapon, each new round must be chambered manually, by moving the breech to eject the empty casing. In semi-automatic weapons, each pull of the trigger fires a bullet. In fully automatic weapons, bullets will be fired as long as the trigger is depressed until either the trigger is released, or the ammunition is exhausted.

The three main types of modern firearms today are bolt-operated, semi-automatic, and automatic weapons. In a bolt-action weapon, each new [[round (ordnance)|round]] must be chambered manually, by moving the breech to eject the empty casing. In semi-automatic weapons, each pull of the trigger fires a bullet. In fully automatic weapons, bullets will be fired as long as the trigger is depressed until either the trigger is released, or the ammunition is exhausted.

[[Science fiction]], such as [[Star Trek]], has postulated many different types of directed energy weapons. These are guns that fire beams, waves, or packets of energy.  Some energy guns can be set to stun, not to wound or kill.

[[Science fiction]], such as [[Star Trek]], has postulated many different types of directed energy weapons. These are guns that fire beams, waves, or packets of energy.  Some energy guns can be set to stun, not to wound or kill.