Multi-caliber survival weapon platform system for revolver/shotgun

A firearm comprising:

• a frame;
• the frame defining a forward aperture;
• a plurality of elongated cylinders rotatably mounted to the frame to rotate on a common cylinder axis;
• the cylinders each connected at their ends, and separate at intermediate portions;
• the plurality of cylinders each defining a passage, each at a common radius from the common cylinder axis;
• each of the passages including a chamber and a rifled bore;
• each of the passages being interchangeable within the cylinders;
• at least one of the passages being chambered for a different caliber than at least one other of the passages;
• and
• wherein the calibers range in size from to 0.2 inch to 0.308 inch and 0.17 inch to 0.223 inch.