Schwerer Gustav was one of two German 80 cm K (E) ultra-heavy railway guns. It was developed in the late 1930s by Krupp as siege artillery. The gun weighed nearly 1,350 tonnes and could fire shells weighing seven tonnes to a range of 29 miles. It was the largest-calibre rifled weapon ever used in combat and fired the heaviest shells of any artillery piece.
10 Famous and Notorious Guns from History - There are now more than three hundred million guns in the United States of America alone. At the end of World War II in 1945, the Soviet army was shelling Berlin with 43,000 artillery pieces. So whatever your opinion on how they should be regulated in America, guns have been a gigantic... - http://toptenz.net