This is being discussed in many places now but I have not seen it here. There are some new rules for U.S. citizens traveling outside of the country with firearms that go into effect next month.

Apparently you are granted an exemption to obtaining an export permit if you are taking three or less firearms or 1,000 rounds of ammunition, but you need to register on line at AES and obtain a number to give to CBP.

This seems complicated and I do not think anyone truly understands the rules yet, including CBP. I imagine (hope) there will be some changes in this after the public outcry but be advised.

https://www.ice.gov/cpi/faq