Abstract: A gun cleaning device is provided that is adaptable for guns having different sizes and gauges of barrels and that can be securely mounted in an operating position at the breech end of a gun barrel for a highly accurate and improved movement of its rod-carrying, end-mounted, bore cleaning element which element is wholly retained within the gun bore. The device greatly minimizes wear and tear on the bore and its lands during a cleaning operation. Its rod is guidably positioned in a carrier sleeve which, at its front end, cooperates with a breech mounting plug to loosely limit its sidewise movement and which at its back end cooperates with a close-clearance-defining bore of a plug-like guide sleeve. The rod also has a rotatable, back-end-mounted grip handle that permits turning movement of the rod and the bore cleaning element with lands of the gun rifling.