Firearm
With a firearm, a mere press of the finger sets off a controlled explosion, followed by a projectile that speeds lethally in a specific direction with tremendous velocity. The fundamental purpose of this mechanical construction is to kill at a distance, potentially even without exposing the shooter to danger. This grants a disproportionate, almost god-like power to humans. They can kill effortlessly from afar, regardless of the shooter's own qualities (such as strength, courage, or intelligence).
Anyone carrying a firearm feels a sense of power and control. As a dream symbol, firearms likely represent this very feeling—the self’s ability to manage a perceived dangerous situation. If the weapon doesn’t function in the dream, the dreamer experiences a sense of powerlessness. This can indicate that the approach may not be suited to the psychological situation at hand.
Firearms offer humans a means of defending against threats that might otherwise be overwhelming, like multiple armed adversaries. In other contexts, however, carrying a firearm can be a disproportionate reaction to a threat.
Revolvers, cannons, and similar weapons use explosions to produce an effect. For this reason, firearms symbolize strong emotions; one is “loaded,” followed by a discharge likely resulting in destructive outcomes.