1x Good spring (That will fit inside of the gluestick)
Good strong glue (not from the gluestick!)
Fimo (modeling clay that can be baked to harden) OR some piping (also has to fit inside of the gluestick)
Step 1: Remove the Glue
Step 2: Craft the Fimo
For everyone else, Take the Fimo, and make it into a small tube, with a hole big enough for the centre piece in the gluestick to get through. Using some more fimo, attach the spring, and then bake the whole thing in the oven.
After you have baked it, and found that it doesn't fit over the central peice in the glue stick, (as my second and third attempt did) use a drill and drill through the fimo, until large enough.
Step 3: Glue Together
If you did not use the fimo, because you had a longer spring, glue that to the plastic bit.
Then leave to dry.
Step 4: Finished!
Now, remember not to fire it at too many people, or they might get annoyed!
If you have any questions/ comments/ complaints I would like to hear them, as well as any modifications!