Thank you for the question.
Earlier, there was a motion to define a firearm part as a barrel or handgun slide, parts that are difficult to make. People tend to acquire them in order to be able to assemble illegally made firearms or ghost guns. Requiring people to have a licence to acquire or import a barrel or handgun slide are measures that the government is proposing in order to address ghost guns.
You already need a licence in order to buy ammunition. It would be the same one that would be applying for these two kinds of parts, as well as for import.