Actually there ARE six tanks, big guns in the LITTLEFIELD COLLECTION, That DO SHOOT. If you read the article, those are the ones that require the permit to own. There was a writeup about this collection and it impending sale a months or back on Yahoo or CNN, I forget which. But in that writeup, it actually told you which ones still fired and needed the permits. Littlefield was one of a very small group of civilians, with such machines and permits. Group being less than 5 IIRC.