I have neither found a link online nore have I seen one posted on this thread.
I did find this, posted on the Oklahoma Shooters website back in 2008:
Get delayed more often then not? Contact the FBI N.I.C.S Operations center and they will mail out a request form for the PIN #
When Filing out the 4473 form, if the buyer has this special pin #, then they will no longer experience delays. The pin # goes right to the buyers History.
The FBI N.I.C.S operations center number is (304) 625-2750
ETA: My bad! swinokur provided the link:
Looks like one has to be a federal firearms licensee. More detailed information about the process, delays, and proceeds is found on the fact sheet on th FBI's website.
Originally Posted by swinokur