Lincoln has an ordinance that you must report sales of some types of firearms to the Police.
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).
http://www.lincoln.ne.gov/city/attorn/lmc/ti09/ch936.pdfMy opinion is this is not necessary if you are outside the city limits at the time of the sale, But I am not a lawyer