Step 1: You Will Need:
Lego man, CLEAN syringe (get that from the doctors) and some blu tack (blue tack as I call it).
Step 2: Step 1
Remove the lego man's head (Don't worry, he wont lose his head if you are careful enough to not lose his head!), then put some blu tack into it.
Step 3: Step 2
Pull the handle all the way back
Step 4: Step 4
Pop the head on. OR YOU CAN ALSO USE THE ARM AS THE PROJECTILE, THE ARM FITS PERFECTLY!
Step 5: Finished!
Now bush the handle as hard as you can, the Lego man's head/ arm should pop out at extreme speed and destroy things!
If you find this is difficult as there is a leak, put some water into it and turn it into a water cannon!
Thanks and have fun:)
NOTE: DON'T FIRE AT THE EYE OR FRAGILE OBJECTS