Vortex ring-producing gun with recoiling nozzle

A vortex ring producing gun comprising:

• a body defining a first interior volume;
• a movable nozzle coupled with the body, comprising at least one nozzle opening, and defining a second interior volume;
• one or more conduits providing fluid communication between said first interior volume and said second interior volume;
• a movable cocking/firing sleeve at least partially surrounding the body and the moveable nozzle;
• an energy storage element between a portion of the moveable nozzle and a first portion of the movable cocking/firing sleeve, wherein the energy storage element is configured to bias the movable nozzle toward the body;
• and
• a latching key configured to hold the movable nozzle in a retained position against the bias from the energy storage element, wherein
• the movable cocking/firing sleeve is configured to interact with the body, the energy storage element, the latching key, and the movable nozzle to selectively cock or fire the vortex ring-producing gun, and the vortex ring producing gun is configured to reduce a length of an external dimension of the vortex ring producing gun along an axis parallel to a central, longitudinal axis of a nozzle bore of the movable nozzle in response to firing the vortex ring producing gun, and
• wherein the bias of the energy storage element is configured to accelerate the moveable nozzle toward the body when the latching key transitions from a latched condition to an unlatched condition, said acceleration of the moveable nozzle is configured to cause compression of the contents of the second interior volume for causing expulsion of at least a portion of said contents through the at least one nozzle opening, and for forming a vortex ring.