This is my slingshot Pistol, designed with MLCad.
Random safe picture.
Step 1: Barrel
Step 2: The Trigger
The Trigger, it is really self-evident.
Step 3: The Handle
Step 4: Assemble
Do that, I don't have a pic. You attach the handle to the second to last clip in the yellow connectors on the Trigger, and the Barrel attaches with 2 green rods to the front 2 clips of the trigger. Add a band to the trigger to the barrel, and add a band to the front of the barrel.