I sent the Nashville CBP an email with my 4457 forms complete info. They stated it was approved and to bring copies with photos of guns to the airport. Their office is directly behind the info desk on yhe lower level with rental car kiosk, and behind terminal exit doors in the secure area. I asked info desk and they said just have a seat and someone would come out. They meant randomly as they come out for a number of CBP reasons for people. I just waited about 20 min until an agent came out, flagged hime down. Gave him copies of my forms, and then he asked for photos, like hard copy photos. All I had was the ones on my phone so he said just email to the same email I had used originally. 15 min later I had my stamped and signed forms. I got the email address from a previous post on this thread. Did not have to make an appointment. Allow about an hour total. Could be longer or shorter depending on how soon a CBP officer comes out of the secure area. I would stay away from lunch time as they probably will take longer.
