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
Step 2: Building the pistol
Take your two pieces of wood,or one piece of wood.Nail one piece to the other piece.It should look like the picture.If you are using one piece of wood just glue a clothespin to the top.It helps keep the rubber band on if you put a notch at the front(e).FIRING:take a rubber band and stretch it back to the clothes pin.Press on the clothes pin to fire.
Step 3: The machine gun
Take your piece of wood 1-3 feet long and cut notches in it(figure a)Then tack string to the front(c)Flat shoelaces work best.Then you must load the gun.Take the string and lay it on top the notches.Take a rubber band and set it on the string on the notches.To fire,pull up and back on the end of the string.
Step 4: Having fun
A way to have fun with these is to shoot tin cans.The machine gun gives you a chance to blast away at targets.The pistols are fun to take careful aim with.