How it Works:
1: Pull the rubber band that is attached to the front onto the 2 white rods sticking out in the back of the slingshot.
2: Rip off one of the slingshot's legs :D (the red connector with a yellow rod on it's middle slot.
3: quickly pull the leg so that the red connector goes between the 2 white rods in the back, pull it up and let go. PEW! you send the leg across the room.
This is an ideal 'shot for fun and mostly non-lethal K'nex wars with friends! It might sting at point blank or the sort, though.
This slingshot it totally built for single-shot, but, if you have enough dexterity, don't forget the multi-shot feature as in all slingshots.
Step 1: List of Pieces Required
LIST OF PIECES FOR THE ITEM:
2 Small Greys
2 Light Browns/Pins
2 Stretchy Oranges
2 Stretchy Light BluishPurples (can be replaced by blue)
10 Deep Greens
1 Rubber band (I use a medium-thick band but the others might work as well)
EDIT: you should be able to do normal purples instead of the stretchy ones; I just use the stretchy ones for comfort.
Step 2: Number 1-10 Steps
Step 3: Number 11-21 (final) Steps
Step 4: Firing
When the rubber band is in place, take an ammo off the Stretchy Oranges, pull it back and out of between the two whites in the back, and fire!