This is an idea that I got from an instructable by Nothing2it so please do not think I am trying to steal his design. However it was my own idea to attach it to the roughcut as an ammo holder.
Step 1: Materials
For this instructable you will need all the knex shown in the picture and the rough cut.
Step 2: Assembling the Knex
Assemble the knex as shown in the pic. Now put the knex ammo rack on the side of the roughcut as shown.
Step 3: Elastic Band
Take a double rubber band and put it over the knex then wrap it round the whole gun a few times then tie the two ends of the band together with string. Now put 8 nerf darts onto the blue rods. The ammo rack is complete, hope everyone enjoys:)