From The Washington Free Beacon:

The ATF disclosed to lawmakers that it manages a database of 920,664,765 firearm purchase records, including both digital and hard copy versions of these transactions. When a licensed gun store goes out of business, its private records detailing gun transactions become ATF property and are stored at a federal site in West Virginia. The practice has contributed to the fears of gun advocacy groups and Second Amendment champions in Congress that the federal government is creating a national database of gun owners, which violates longstanding federal statutes.