Licensees must record any initial “proceed”, “delayed”, or “denied” response received, as well as any transaction number provided. If the initial NICS response was “delayed,” a licensee must also record the date and response later provided, or that no resolution was provided within 3 business days if the licensee transfers the firearm after the 3 days. In addition, if a licensee receives a response from NICS after a firearm has been transferred, he or she or she must record this information.
[18 U.S.C. 922(t); 27 CFR 478.124(c)(3)(iv)]