Create an orange tip or tape/paint the tip orange and make sure it's labeled something like "replica". It looks like the magazine has fake bullets in it,I would make sure it's separate and labeled as well. a Quick letter inside addressed to the TSA/DHS/ICE with a very short explanation that it's a non-functioning prop and can't be made to fire live rounds (look at an airsoft or fake gun on ebay and use a disclaimer similar) would probably be good too.