Pipes, Plumbers, Other Spare Parts • 41 Don Walsh, instructor at the Correctional Staff College Museum in Kingston, Ontario, Canada, examines the 1 2-gauge pipe gun made by an inmate in the Collins Bay prison fora breakout attempt. (Courtesy of M.E Millar J * portion of the breech filed away so as to permit a fingernail or knife blade to get hold of the cartridge rim and