How did the Soviets approach the problem of unrest in the youth? Its by helping the youth build communal bonds among themselves, their community, their motherland, and their party that helped extinguish the anarchy left over from the Civil War alongside guaranteeing stability of home through the economic rights their parents had. It means educating socialist values while building a socialist material world to grow in.

For adults that still retain mindsets of the old world, I would imagine it'd be best to use Axont's proposal of the Swiss system with modifications for local conditions. Different types of communal depots or arsenals organized by either local enthusiasts, historical collectors, hunters, or outright gun nuts with full state supervision and with the possibility of financial support or other beneficial options as a proverbial carrot to encourage compliance. There's of course considerations at play for urban and rural people as well. I suppose the goal is to make it so that the huge gun hogs that just want to demo-ranch style shit can do so in a safe environment and sort them out from the outright insurrectionist-brained gun hogs.