Some cities may have a requirement for reporting the sale of a handgun to the local gendarmes
I think this is true for Lincoln, but I have never sold a handgun here, so I don't know the drill
Edit;
here is the ordinance
9.36.030 Report of Sale of Firearms.
Any person, firm, association, or corporation dealing in firearms of any type shall, on the
same day of the sale of any firearm, except a shotgun or a rifle of a type commonly used for hunting,
report the sale to the Police Department on forms as prescribed and furnished by the Police
Department. The report shall contain all the information requested thereon. (Ord. 15625 ?3; July
9, 1990: P.C. ?9.28.025: Ord. 15443 ?1; February 20, 1990: prior Ord. 7936 ?1; December 26,
1962).