27 C.F.R. § 479.71 Proof of registration.
Title 27 - Alcohol, Tobacco Products and Firearms
The approval by the Director of an application, Form 1 (Firearms), to make a firearm under this subpart shall effectuate registration of the firearm described in the Form 1 (Firearms) to the person making the firearm. The original Form 1 (Firearms) showing approval by the Director shall be retained by the maker to establish proof of his registration of the firearm described therein, and shall be made available to any ATF officer on request.
Title 27: Alcohol, Tobacco and Firearms
PART 479—MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS
Subpart E—Tax on Making Firearms
Registration
§ 479.71 Proof of registration.