Instructables
This is a knex gun that uses a firing mechanism that is similar to a catapult. It is pretty small, can fire any length rod, and has a true trigger. The actual power comes from pulling the trigger, not from a rubber band, so the distance it shoots depends on how hard you pull the trigger. This also makes it so don't need to cock it back each time you shoot.

Any comments or constructive criticism (even negative) are appreciated. And please rate it if you like it. Thanks.
 
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Step 1: Body and Handle

Just follow the pictures... Not too complicated.

Step 3: The Arm

This is the part that flings the ammo rods into the air. A little more complicated, but you should be able to get it through the pictures.

Pics 1-3: Show the whole arm from different angles
Pics 4-5: Show two different parts of the arm
Pic 6: Shows how to put the two pieces of the arm together
Pics 7-10: Show how to attach it to the body

Step 4: Rubber band and Operation

knex 1 030.JPG
knex 1 033.JPG
knex intro 1.jpg
Put the rubber band that keeps the arm back in the following spots. To fire, just stick any size rod in the orange connectors' hole on the arm and then pull the trigger. I've found that blue rods work best as ammo.