I don’t know if there is any precedent from taking away hundreds of millions of guns from an armed country actually
Australia de-armed pretty successfully.
Australia has more guns now, and more guns per capita, than it did at the time it almost unified all gun laws.
It didn't "de-arm" - it brought all states and territories into near alignment on gun regulation.
If you're interested I can link to good footage of my actual IRL neighbour shooting 24x24 inch targets at 5,000 yards, here in Australia.
* https://www.youtube.com/watch?v=7owwTz7Z0OE
Alternatively you might be interested in Australian footage of feral control, taking down 800 oversized wild pigs in 4 hours from a helicopter.