You don't even need the gun - you just need the case.
We carry long lenses and tripods in a Pelicase - the only one that fits is the gun case design.<p>If you buy the camoflage pattern one it is generally treated as a gun by the airport - even if you don't declare it.<p>It means a trip to the luggage office at the destination to recover it from the locked secure baggage area but thats a small price to pay for a free armed guard.