Do not bring your gun to the airport. It may sound like common sense, but it is a message the TSA said is not getting across.

"You need to get yourself a hard sided case,” Transportation Security Administration spokesman Mark Howell said, showing how you can legally take your gun on a commercial flight.

It must be checked in your baggage and declared with your airline.

>> Read more trending stories  

The TSA is taking this message to airports around the country as they see an increase in guns coming through security checkpoints.

Howell said, “Before you go through the airport, do a five minute sweep of all your belongings to make sure you don't have those guns or prohibited items in your bag.”

A passenger caught with the gun will likely face criminal charges. The FBI will even be called.

The TSA can assess a fine of up to $13,000 dollars.

So, the TSA set up a table to spread the message. If you are going to bring a gun on your trip, you need to follow the rules.

“We just want to make sure that it's done the safest way possible and that it's stored underneath the aircraft,” Howell said. “Obviously we don't want it accessible during flight.”

In addition to the TSA rules, different airlines have different forms for declaring a firearm in your checked bag.