With the exception of Switzerland
Swiss authorities have a list of about 2,000 individuals they suspect of being willing to commit shootings. All of them are frequently approached by authorities, along with psychologists, and are forced to hand over their weapons immediately
background checks are mandated, which is not always the case in the U.S.
Hunting weapons must be registered with the local Canton. Pistols, rifles, and semiautomatic weapons require a license.
https://www.theatlantic.com/international/archive/2018/02/swiss-guns/553448/
