Probably very few. Liberals who are alienated with the U.S. would sooner move to Canada for the healthcare, conservatives alienated with the U.S. would sooner be dead than be alive in Australia without guns if their bumper stickers are to be believed.
In 1997 they banned “defensive” firearms. The guns you want because they work well. Semiautos, center fire handguns, pump shotguns. Bolt actions are still possible to get, but not great at self-defense, or overthrowing your government.
Side note… in 1997 these guns were banned, and crime fell. As it turns out though, not only was crime already going down, but there was an increase of 2x police per capita, and curiously crime in the USA fell at a greater rate with no gun ban or large increase in police, crime was high in the 90s for some reason, some people say lead paint bans but the causation is weak.
