Just a thought…make an appt with CBP for a signature on a completed 4457 for items you are traveling abroad with…do not mention it is a firearm…or where you are traveling…show up with the rifle, your passport and completed 4457. The 4457 can be completed by you on line with all your information except for thelir signature and stamp, date and facility number. A new form that is completed on line is available, but the expiration date is still Sept 30, 2022. I normally have four originals, but you can always make copies on a printer, in color, that looks exactly like the original. In central illinois it is so accommodating to get one done with a phone call appt., in Peoria, the CBP agent told me he was still using the older forms with no expiration date and has had no issues in his thirty years with the forms.