This is an FBI issued number as it's NICS related.
To have been given a PIn (actually called a UPIN), you must have applied for it.
As always,,there's a form for that.
The FBI does not just send them on to any & all persons who have trouble with Delayed NICS checks.
The UPIN is issued to persons who actually are qualified to purchase, but for reasons in the system, they are often Delayed.
They then go ahead an apply for the number to help ease them through NICS checks in the future.
The UPIN holder must still go thru a NICS check when purchasing, but that # included in the 4473 is (supposed) to clear the way passed what was delaying their purchase.
If you've already been issued a UPIN # from the FBI and have lost it,,contact the NICS/FBI at the email address or USPO address given in the form in the link down below..
Here's a swipe from it showing the info about contacting them re: the UPIN#
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FBI CJIS Division
NICS Section
NICS Functional Support Unit, Module D-1
P.O. Box 4278
Clarksburg, WV 26302-4278
Help with VAF/UPINs
For help with VAF and UPINs, including forgotten UPINs, contact nics@fbi.gov or via mail at the address above.
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Here's the Appeals & VAF (Voluntary Appeal Form--UPIN) Form
https://www.fbi.gov/services/cjis/nics/n...ics-appeals-vaf