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This video will teach you step by step on how to make a pen gun. These guns fire hard, and fast! They are very easy to make, you can make it using a few simple household supplies!
The Atomic Cannon, at 280 mm, was the largest nuclear capable mobile artillery piece manufactured by the United States. On May 25, 1953, a 280 mm cannon fired an atomic projectile a distance of 7 miles at the Nevada Test Site. Twenty 280 mm cannons were manufactured. None were used in battle. (Sound effects Added.)