How to Make a Knex Balistic Knife

this is a instructable which will take about 5 minutes to build a knex balistic knife. 

Step 1: Step 1: the Chamber of the Knife

pic 1: build this

pic 2: add the red rod and red conector with white rod attached

pic 3: another view

pic 4: build this

pic 5: insert through middle hole

pic 6: add elastic band

Step 2: Step 2: the Knife

pic 1: build this

pic 2: insert through middle hole

Step 3: Have Fun With This

now go have fun and any moddifications please post to me i would also like to know what you think of the knife thanks for looking at this tutorial :D please dont put on bad comments it is my first instructable        :D