An approved 5320.20 form is required to travel across state lines with any NFA item. Providing of course that the state lines you cross, legally allow the weapon as well. As some states ban various NFA firearms. Now let’s say you live on the border of two states. Both that Legally allow the NFA items that you own hat have the ATF NFA Tax stamp. Let’s say one lives n Texarkana Texas. A city that is both in Arkansas and Texas. Their are some farmers that own land that is on both sides of the state line and actually connect as one main property. Even though legally speaking they have two separate real estate deeds and are legally two separate properties. Would the person who owns these two connecting properties need a 5320.20 to Legally go back n forth on their property? If they do, how often would they need to file one, and what is the maximum amount of time they could have one for? One gentleman friend I know, has a very difficult time being able to tell on some areas of his land if it’s on the Texas or Arkansas side. (Heavy trees). Land has been in their family for many generations. He did tell me they have always had two separate deeds. His house and mailing address are on the Texas side. If I were to visit him with my NFA Firearm, would I need to get a 5320.20? Just to be legal. Odds are law enforcement would never know, and it would never be an issue. But you never know if some incident were to happen, or a game warden from either side happened to be a little nosey.