Is there a need to declare 80% lower at the airport if traveling outside of the US? ATF certifies that they do not consider 80% lower a firearm. Customs in destination is not an issue. I'm more concerned if i'll be able to fly out of USA at all?
Is it legal to travel out of the country (USA) with rifle build kits including the 80% lower? Does one need to declare it or nothing at all since it's not considered as a legal firearm.