Paintball and Airsoft guns are allowed in checked baggage and are not subject to the container requirements of firearms. Customers must declare the paintball or Airsoft gun at the ticket counter.
Compressed gas cylinders are allowed in checked baggage or as a carryon only if the regulator valve is completely disconnected from the cylinder and the cylinder is no longer sealed (i.e., the cylinder has an open end). TSA Agents must visibly ensure that the cylinder is completely empty and that there are no prohibited items or paintballs inside.