Large bore gun cleaning apparatus with expanding disc mandrels

A gun cleaning apparatus comprising:

• a central member;
• a plurality of disc mandrels, each disc mandrel having a center cylindrical wall substantially perpendicular to a disc plane, said central member passing through a hole in each of said disc mandrels defined by said center cylindrical wall, said plurality of disc mandrels stacked adjacent to one another on said central member, and each disc mandrel of said plurality of disc mandrels comprising two cup sections affixed to each other in said disc plane;
• a central member end stop disposed at one end of said central member against a first side of a first disc mandrel;
• an adjustable end stop disposed on said central member about adjacent to a second side of a last disc mandrel, said adjustable end stop having a linear position adjustable in a compression direction, from a first level of linear compression of said plurality of disc mandrels setting a first radii of said disc mandrels in said disc plane, to a second level of linear compression different than said first level of linear compression of said plurality of disc mandrels, setting a second radii of said disc mandrels in said disc plane different than said first radii;
• and
• at least one mechanical coupling disposed at an end of said central member to accept a cord or rod.