If the owner of the guns is dead, you can not get them from the police not being the owner.
Yes, police officers typically carry firearms as part of their duty to maintain public safety and enforce the law.
With.
Yes Most do.
they get over 10 guns a year.
That all police in UK do not carry guns.
Yes, Japanese police are armed.
It depends
Yes
Guns, tasers, police sticks, walkie talkies, etc.
The only police to use firearms in the UK, are specialised groups such as the Civil Nuclear Constabulary, or special teams within territorial police forces. When the metropolitan police force was established, officers did not carry guns.
If you take the example of the UK (where guns are banned), the normal police on duty on the streets are not armed with guns. There are UK police trained to use and carry guns but they only do so when responding to a situation where a criminal is seen to be armed. Based on this tried example, is is clear that if guns were banned effectively, the police would not need to carry weapons.