Good Hint Ladd! They come from ILLINOIS!!!!! (PDF)
BTW this data isn’t unique, every state report I’ve read, and every year I’ve read it shows that the vast majority of the ATF traced guns trace right back to the state where they were recovered.
Sorry kids, but the “Iron Pipeline” is about as real as bigfoot!
Oh and on another note does anybody know what that bizzao gun is at the top of the ATF PDF? Looks like an old Beretta had a lovechild with a SIG, and probably drank during the pregnancy.