Switzerland is holding a referendum aimed at restricting gun ownership.
If approved, it would end the long tradition of Swiss men keeping their army weapons at home both during and after compulsory military service.
Weapons would have to be registered, stored in armouries and owners would have to show they know how to use them.
Supporters of the controls say suicides and gun crime would be reduced. Those against say locking weapons in arsenals would undermine trust in the army.
There are an estimated two to three million guns circulating in Switzerland, but no-one knows the exact number because there is no national firearms register, says the BBC's Imogen Foulkes in Geneva.
In addition to the semi-automatic assault rifle that all those serving in the army store at home, there are thousands of hunting rifles and pistols.
Serving and former soldiers have been allowed to keep their weapons at home since World War II. BBC News
