The Bug a salt gun has been used as a toy and christmas gifts for family members of our customers before and is only using table salt as an "ammo". However you must be 18 years old to purchase the unit and is advised as with most toys by the manufacturer to have adult supervision. If you concerned about the safety of your kids if they were to miss-use the gun you can contact the manufacturer to assess any risks that may come about. Skell Inc can be reached at 310-392-3288.
Per the Bug-A-Salt web sites FAQ(frequently asked questions):