You can. It is not against the law to own fully automatic weapons provided you follow all the rules. 21, clean criminal record, money to buy, CLEO signature, etc..
yes
no
Firearms are objects. They have no more legal standing than your armchair. In certain countries firearms are legal in others there are restrictions on the type of firearms citizens may own. It depends on the legislation of the country you are referring to
No, they cannot.
Yes, in accordance with the provisions of the National Firearms Act of 1934.
Depens on where you are. In the US, ordinary citizens may own semi-auto firearms, an in most states, fully automatic firearms (machine guns). They are required to be registered with the BATFE, and a transfer tax paid when fist buying one. They are VERY expensive, but legal. In other countries, other laws.
A civilian cannot own an M4 carbine because it is classified as a military firearm and is subject to strict regulations under the National Firearms Act (NFA) in the United States. The M4 is a fully automatic weapon, and civilian ownership of fully automatic firearms manufactured after 1986 is prohibited. While civilians can own semi-automatic variants of similar rifles, the specific M4 designation and its features are restricted for military use only.
Depends on what you mean by automatic guns, and the law where you live. You did not tell us where that is, so there is no way we can answer. Where I live you CAN legally own fully automatic firearms (machine guns) but they are horribly expensive. An M16 rifle that may be owned by a private citizen is between $12,000 and $16,000.
Not everywhere. In the US, law abiding adults have the right to own and use firearms. This is guaranteed both by various state laws, and by the 2nd Amendment to the US Constitution.
In the United States, owning a fully automatic AK-47 is heavily regulated under the National Firearms Act (NFA) of 1934. Individuals can own such firearms if they were manufactured before May 19, 1986, and if they successfully complete a rigorous application process, including background checks and tax payments. New fully automatic weapons are generally not available for civilian purchase, making ownership quite rare and subject to strict legal requirements.
The short answer is no, unless you have a firearms collector's licence. A fully automatic weapon is a restricted weapon and unless you have the correct licence you are not allowed to import them or own them. The collector's licence is difficult to get and restrictive.
In typical combat situations any soldier killed dies with his own weapons, or the weapons issued to him by his combat unit.Only rarely do people kill themselves with their own weapons, though suicide with one's own firearms is more common than suicide with someone else's firearms.