Preventing Illegal Weapons Trafficking Act of 2025

Creates a federal effort to stop the importation and trafficking of parts that convert ordinary guns into machineguns. It defines “machinegun” by cross-reference to the Internal Revenue Code, defines “machinegun conversion device,” requires an interagency plan and regular reports on detection, seizures, training, tracing (including 3D‑printed parts), and adds a new statutory definition for illegal machinegun trafficking in the Internal Revenue Code while expanding annual firearms‑trafficking reporting to track these devices.