This is something I made when I was trying to make a K'nex rod spin in flight. I know there are true rifles like the Tempest, which uses a oodammo, and I know someone else twisted a rod to make it spin. This thing should be able to shoot normal K'nex rods with no modifications. I just built this, but I didn't make it into an entire gun. The red rod in the pictures is the ammo. This uses a K'nex wind up motor to spin the ammo. When you stick the ammo into the motor, it is like a bullet lock. The thing in the third picture is like a ratchet. It keeps the rod from spinning. It would have to be connected to the trigger, so it lets the bullet spin just when the ram hits it. Someone else could make a gun with this idea, but please give me credit for the idea.