A gun is generally defined as a tube based mechanism that launches some form of projectile through an internal source of explosive energy that forces the projectile out through the tube.
Systemically, a gun is a man made portable mechanism that directs energy toward the launch of projectiles. The purpose of the gun is to damage or kill, to practice skill via targets, to collect for enjoyment or profit, or to control, threaten, or deter people.
These same purposes can be served by various other directed energy mechanisms such as bombs, grenades, missiles, artillery, bow and arrow, or stones.
Other systemic forms that also can be applied for these purposes are knives, hard or heavy objects, various kinetic forces that involve the legs, arms or mouth, man made chemical or biological compositions, certain machines or vehicles, whips and chains, traps and prisons, and so on….
Systemically (ignoring the non lethal skills and practice aspects of guns and ignoring hunting) Y Worlds views guns across the following spectrum of models:
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