Abstract: A self-propelled explosive system is configured to fit within a barrel mounted on a tank. The system includes: a carrier body defining an interior volume; an explosive within the interior volume; a wheel extending from the carrier body to propel the system to a position within the barrel; a foot extensible from the carrier body, preferably so as to hydraulically lock the system in place within the barrel; a proximity fuse at the front end and the rear end of the carrier body to set off the explosive if tampering is detected; a motor operably connected to the wheel to rotate the wheel and propel the carrier body to a desired position within the barrel and to extend the foot from the carrier body to press against the inner wall of the barrel and lock the carrier body in place.