ATF Ruling 2016-4 - The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) authorizes an alternate method or procedure in lieu of the method or procedure prescribed in the regulations that currently require an importer to submit to U.S. Customs and Border Protection (CBP) an original, paper copy of ATF Form 6A, Release and Receipt of Imported Firearms, Ammunition and Implements of War (Form 6A), to import firearms, ammunition, and other defense articles.