I don' t think they would let you carry on any gun parts at all. They wouldn' t even let me bring a bow limb. You could always lie and say it' s a spare part to your car, if they ask. I think it would be pretty obvious tho. But you don' t need to worry. The gun doesn' t need to be non-functional (or at least I don' t think it does). Plenty of people travel with guns. Make sure you call them up and find what case and locks are required and if you need anything. Keep it simple. No ammo, of course. Good luck.