27 CFR § 478.131 - Firearms transactions not subject to a NICS check.
(a)
(1) A licensed importer, licensed manufacturer, or licensed dealer whose sale, delivery, or transfer of a firearm is made pursuant to the alternative provisions of § 478.102(d) and is not subject to the NICS check prescribed by § 478.102(a) shall maintain the records required by paragraph (a) of this section.
(2) If the transfer is pursuant to a permit or license in accordance with § 478.102(d)(1), the licensee shall either retain a copy of the purchaser's permit or license and attach it to the firearms transaction record, Form 4473, or record on the firearms transaction record, Form 4473, any identifying number, the date of issuance, and the expiration date (if provided) from the permit or license.
(3) If the transfer is pursuant to a certification by ATF in accordance with §§ 478.102(d)(3) and 478.150, the licensee shall maintain the certification as part of the records required to be kept under this subpart and for the period prescribed for the retention of Form 5300.35 in § 478.129(c).
(b) The requirements of this section shall be in addition to any other recordkeeping requirements contained in this part.