Pepper sprays as a self defense item had their origins literally thousands of years ago, starting with the Chinese when they threw bags of hot spices that their enemies. They have been used for civilian self defense since the 1990s. So they're not a new product. They are however the most widely sold and used self defense product in the world. Pepper guns are relatively new. The Mace Pepper Gun shoots out a stream of 10% concentration of oleoresin capsicum up to 25 feet away. It uses replaceable cartridges that...