(Source: U.S. War Department Technical Manual TM 9-1729A, 1944.) black-and-white diagrams illustrations photos M19 Twin 40-mm Gun Motor Carriage March 12, 2013by Lone_Sentry_Admin1 min read Illustration of the M19 Twin 40-mm Gun Motor Carriage. (Source: U.S. War Department Technical Manual TM 9-1729A, 1944.) (Source: U.S. War Department Technical Manual TM 9-1729A, 1944.)