To Build a miniature blow gun.
You will need:
Straight pin with ball or flat head on back end
Hot glue gun
Note: this same process can be scaled up using PVC pipe for a more typical blow gun size.
Step 1: Disassemble a Pen
Remove both ends of a pen and discard the two ends. The tube will become the blow gun
Step 2: Create a Paper Cone
Take a strip of paper and roll it into a cone. The cone should come to a sharp point and be as long and thin as possible. Once the cone is created, use a tiny piece of tape to fasten it right at the cone tip.
Step 3: Trim Cone to Size
Place the pointed end of the cone carefully in the pen tube and mark where the cone meets the tube. Then cut the cone at the mark.
Step 4: Test the Cone
Place the cone into the tube and blow into the tube, the cone should not be loose enough to fall out, but should easily be blown through the tube.
Step 5: Add a Pin to the Cone
Once the cone is trimmed correctly, add a straight pin for the projectile tip. The pin should have a ball or head on one end (not a sewing needle). Poke the pin point into the cone from the back so it points out the front of the cone.
Step 6: Glue the Pin Into the Cone
Heat a glue gun, and dip the pin ball or head into the glue. Quickly pull the pin snug inside the cone so the pin ball becomes affixed inside the cone tip. Hold the pin and cone so the needle glues straight in line with the cone.
Step 7: Test Fire the Blowgun
Place the "dart" pin tip first into the pen tube. Aim in a safe direction, then give a quick blow into the pen tube behind the dart. The dart will fly out and, if your aim is good, stick into the target! Enjoy building your marksmanship!!
(The pin needle can be replaced with an air soft pellet if the pin is deemed too dangerous!!
WARNING: the projectile is dangerous!!! Never aim at a living thing!!!! Adult supervision should be generously given!!!!