Three Barrelled Knex Gun

I was trying to come up with a mechanism with a firing pin and a true trigger. This gun is the result and although it isn't very powerful, i'm hoping someone will be able to improve on my design.

Step 1: What You Need

Step 2: Make the Barrels

Step 3: Make the Trigger

Step 4: Connecting Trigger to Barrels

Make two of the first picture

Step 5: Making and Attaching the Handle

Step 6: Inserting the Ram and Adding Rubber Bands

And you're done. Please feel free to ask questions and leave comments.

And remember that this is a prototype and does not work very well. so please, not too much critisism. Thankyou