I didn't know you could check a firearm number from the library...that one's good to know. I'm still thinking the police wouldn;t have a problem running the number for you. Of course, if it came up stolen or wanted, they might want to have a little chat with you about where the seller and gun is

The last time I bought a pistol from a private seller was in about 1991, and that was from a Texas game warden, so I didn;t worry about particulars. But I did get a receipt.

The last rifle I bought private was probably in the early 80's. I got a receipt but was way too dumb back then to think of having the serial number checked. Plus, the seller was in his home, with family, and a super-nice collection of guns. I would never have suspected anything wrong with the rifle.