Things You'll Need
Instructions
Measure 8 inches in from one end of the PVC pipe. Mark the pipe with pencil to show measurement.
Use a utility knife to cut a square shaped notch in the PVC pipe. The square will only have three sides. The side without a line should face the shorter end of the pipe.
Twist a 3-inch section of duck tape into a rope shape. Insert this rope shape under the notch. Secure both ends of rope with another piece of duck tape.
Hook two to four rubber bands to the notch so that they hang on the inside of the pipe. The more rubber bands you use, the more power your spear gun will have.
Sand one end of the wooden stick into a point. Cut a notch in the other end that is large enough to hook the rubber bands to. Insert stick into pipe. Hook rubber bands on the stick's notch. Pull back, aim and fire.