I used 4 rubber bands, but you can add as many as you want.
True trigger :D
almost never jams
handle's not super-duper
loading can be annoying sometimes
For my next instructable, I think I'll try to tackle this:
...except it will shoot, but it probably won't have any type of actual rapid fire :
Step 1: Handle
I don't even think you'll need notes for this part, let alone the entire gun.
Step 2: Trigger
Three pieces you will make, one step at a time.
Rest of pictures:
How to make piece at the bottom of clump of 3 pieces, the trigger