A bill for an act relating to identification markings on firearms and firearm parts, and providing penalties.

SF 2123 requires individuals who manufacture firearms (not licensed dealers) to obtain a unique serial number or identification mark from Iowa's Department of Public Safety by December 1, 2026, and permanently affix it to the firearm or unfinished frame/receiver. It prohibits removing, altering, or defacing existing identification marks on firearms and bans possession of unfinished frames/receivers without a mark after 2026. The bill exempts federally licensed manufacturers, antique firearms, pre-existing firearms, and transfers to law enforcement. Violations carry class C felony penalties, but the law focuses on creating a tracking system for homemade firearms and parts.