This is one of my favorite things to play with.It can knock over a tin can.It involves no k'nex (for the people that don't have any) and is easily built.I recently was thinking that we have no rubber band gun instructables.So I made this instructable.
Step 1: materials
You will need:(for machine gun)
Piece of wood about1-3 feet long
flat shoelace or string
flat top thumbtack,and rubber bands
Two pieces of wood