Changes

The '''gun''' is a mechanical [[weapon]] which uses expanding gas or some other propulsion method to fire a [[bullet]], [[dart]] or other projectile through a tube (its shaft).  

The '''gun''' is a mechanical [[weapon]] which uses expanding gas or some other propulsion method to fire a [[bullet]], [[dart]] or other projectile through a tube (its shaft).  

The four main types of modern [[firearm]]s 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.  

The four main types of modern [[firearm]]s today are bolt-operated, pump action, semi-automatic, and automatic weapons. In a bolt-action weapon, each new 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 ammunition 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.

In semi-automatic weapons, each pull of the trigger fires a bullet, each shot ejecting spent brass and loading new ammunition 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.