I cant believe i couldn't find anyone else making one of these. All this is is wood and a clothespin in the basic design, but mod this up and creates multi-shot ones or crossbows.
Step 1: Materials
All you need for your rubber-band pistol is a peice of scrap wood with around 2 in. X 4-8 in. X 1/4 of an inch. You will also need a small nail and a clothespin.
The wood needs to be cut at a 45 degree angle on one side and pretty flat on the other side.
Step 2: Add Everything Else
Take the clothespin apart and attach the bottom part (wood) to the 45 degree angle so the tip just clears the edge. Nail this in. Then put all the parts of the clothespin on it and your ready to shoot.
Step 3: Shoot Something... Hopefully Something
Just put a rubber band in between the "jaws" of the clothespin and on the end. With a little practice this can shoot well enough.