How to Make a Ballistic Knife from a Candy Dispenser [Spetsnaz]

In this video I show how to transform a simple candy dispensing toy into a miniature ballistic knife. As seen in the demonstration at the start of the video, the knife is quite powerful for its size. The blade is made very lightweight which gives it only a minor amount of penetrating power, but because it weighs so little it is able to fly quite a long distance. There is enough force in the projectile to plant it firmly into cardboard or wooden targets at a distance of 15 feet or greater.
While it is a very entertaining device when directed downrange at a cardboard shooting gallery, ballistic knives are inherently dangerous and should be treated as such. This knife will penetrate skin, and almost certainly penetrate eyes deeply enough to cause blindness. Safety glasses are absolutely required. Though I provide information on how this knife is made for entertainment, I cannot recommend that anyone make it themselves. There are no safety features, meaning the knife can very easily fire accidentally if the button is pressed, or if the blade is knocked off the lip it rests on. There may also be some legal concerns about owning ballistic knives depending on what part of the world you are in. In the USA they are not prohibited to own on a federal level, but there may be stricter regulation in various state laws. It is almost certainly illegal to carry any ballistic knife in public places, and even if not, it would be a terrible idea.
For those interested in the federal laws concerning ballistic knives, the legislation can be read here: http://www.law.cornell.edu/uscode/uscode15/usc_sec_15_00001245----000-.html
If you simply must try something like this for yourself, I recommend making a ballistic spoon, or perhaps the dreaded flying spork. Something that is less likely to land you in the hospital for a severe eye injury as the result of a minor mistake. Plastic utensils would fly the furthest.
Tools & Materials
Four PEZ Dispensers
One Pen
3" x 1/2" Blade (Or Spoon)
Hot Glue
Super Glue
Scissors
Pocket Torch or Lighter
3/16" Drill Bit & Drill