Caliber .50, M2 Browning Machine Gun: How the Gun Works. By General Motors, AC Spark Plug Division. Books / Paperback History: Military › Firearms Publisher: GM/AC Spark Plug/Frigidaire, May 1943., January 1943 Price $27.83 Free Shipping Send to a friend Used - Good Good condition. (guns, reference) $27.83 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.