NCIC information is not directly available to the public. I have usually asked a police officer I know to run the number if I have any question about the deal. Be prepared to give up the weapon and the Seller information if it comes back hot. I have had that happen twice in 35 years. Some agencies automatically run all gun sales through NCIC some dont. One time a friend of mine from Montgomery Ala. picked up a luger at the Birmingham Gun show. Being a correctional officer, he ran the number when when we got back. It came back hot. FROM MONTGOMERY!!!. The report from the agency HAD A SERIAL NUMBER THAT DID NOT INCLUDE A LETTER. HIS LUGER HAD A LETTER. He did not know who he had purchased the gun from and asked me to see what I could do. He knew about where the seller's table was at the show. I tracked the seller in Alabama down to a collector in Missisppi who had purchased the gun from Ralph Shattuck 15 years before the sale. Ralph was kind enought to give a letter on the pistol and my friend was able to keep the pistol . This link may help
stolen guns