The Krupp K5 heavy rail artillery used by Nazi Germany during World War II. Here's some additional information about this weapon: The Krupp K5 was a heavy rail gun weighing 218 tons and capable of firing a 243 kg shell. This gun had an effective range of up to 64 kilometers. During World War II, only 25 Krupp K5 guns were produced. Two of these guns survived the war and are on display in museums, including the United States Army Ordnance Museum. One of the famous Krupp K5 guns was nicknamed "Anz