Both BB and Airsoft guns can use Springs, Air, Gas or CO2 as a means of propulsion.9 jul 2012
Is owning an airsoft gun illegal?
In the United States, Federal Law states that airsoft guns are not firearms. They are legal for all ages. However, in some states, their definition of 'firearm' does allow for the inclusion of airsoft guns. In these states, the firearm definition includes propulsion by spring or compressed air.