K'NEX is the world's most famous constructive toy, which means you can build just about anything. You can take the K'NEX plastic pieces and build all kinds of contraptions, everything from boats to airplanes to robots to weapons.
Watch this video tutorial to see how to build a K'NEX Gatling gun. Just get out the right plastic pieces and an elastic band and you'll have your own mock Gatling gun made purely from K'NEX rods and other parts. This machine gun is not only fun to build, but fun to shoot.