Gun

A gun is an aimable weapon that launches projectiles at high velocity, or a
device that resembles such a weapon used for other purposes (e.g., glue
gun). The term is also used for types of artillery with long barrels that
fire at a relatively flat trajectory.

For handguns, long guns and historical cannons the projectile is a bullet,
shot by explosives (gunpowder), but it does not contain explosives itself.

For modern artillery the projectile is a shell, containing explosives.

Technically speaking, the projectile is the weapon and the gun is the weapon
platform, although with the use of bayonets and rifle butts as clubs, the
double usage of the word could be forgiven.

Types of guns:

   * Handgun (Also called a pistol; a gun used for short distances, fired
     from the hand).
        o Derringer
        o "duelling" pistols
        o Flintlock
        o Wheellock
        o Pneumatic
        o Revolver
        o Semi-automatic
        o Single-shot
        o Machine pistol

   * Long gun (A gun used for longer distances, fired from the shoulder).
        o Muzzleloader
        o Muskets - flintlocks, wheellocks, matchlock
             + Charleville musket
             + Brown Bess
        o Pneumatic
        o Rifle
        o Shotgun
        o Carbine
        o Semi-automatic
        o Submachine gun
        o Machine gun

   * Artillery (A larger gun typically for battlefield use, firing larger
     projectiles, and often mounted on wheels or on a vehicle such as a
     tank, boat, or aircraft).
        o Anti-aircraft
        o Cannon
        o Autocannon
        o Gatling gun
        o Howitzer