Revolutionary Knex Gun Competition 1 Results Answered
The winner is a weight powered slingshot made by Hiyadudez.
His explanation of how the gun fires;
It's basically a normal gun rail, with a 'car' on the rail. Attached to the 'car' is string that runs to the front of the gun and over some pulleys. Attached to the other end of the string is a big weight/counterweight. When released, it pulls the car forward (the bullet is in front of the car) and sends it flying out of the barrel, but the car stays in. It shoots a blue rod 10-15 feet.
Thanks to everyone who participated. The next contest can be found here.