When transferring firearms that are restricted by the NFA, it is important to mail your Form 4 to the proper address. There are several addresses floating around but at this time all Form 4’s should be mailed to the following address:
National Firearms Act Branch
Bureau of Alcohol, Tobacco, Firearms, and Explosives
P.O. Box 530298
Atlanta, GA 30353-0298
The same for is used when you are purchasing as an individual, business, or NFA Firearms Trust.