Re: FBI can't unlock smartphone
Ask the Australian government. Following the Port Arthur massacre, gun laws became one of the tightest in the world.
Gun amnesties were run. Anyone with a gun who didn't have a legitimate need for it was required to hand their weapon in or have it disabled.
Once the amnesty was over, anyone who still hadn't handed their gun over was invited for a chat with the boys in blue. Sometimes they were invited to stay in a big house with lots of other naughty people who had done something wrong.
Gun control isn't complicated. But it does need balls to take the step of removing weapons - especially assault rifle and military grade weapons systems - from the hands of the general population. Something that no American senator or politician has.
Thats how I would plan to remove gun ownership.