Targets illegal “switches” and other machinegun conversion devices by ordering the Justice, Homeland Security, and Treasury Departments to launch a plan within 120 days to stop imports and trafficking, improve tracing, train officers, and collect data (including on 3D‑printed parts and ports of entry). It also clarifies forfeiture law by defining “illegal trafficking of a machine gun” in the tax code and expands the annual federal firearms trafficking report to include how often these devices are used in crimes and whether they were made in the U.S. or abroad.