Yes, with restrictions
Yes, they are legal under State law. Idaho state law does not prohibit ownership of fully automatic firearms by private citizens. However, Federal law requires that any fully automatic firearm have been registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives.
It is legal for the government to execute criminals via stoning, but not legal for private citizens.
Depends on the laws of where you are. In most of the US, Yes, they are legal. Some states have specific restrictions to meet their state standards (such as California, but there are versions that are legal there. Outside of the US, laws vary greatly. Some countries do not permit private citizens to possess semi-automatic firearms.
It is not legal for private citizens in the US to own.
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
Yes- air weapons are amongst the few firearms it remains legal for a private individual to own in the UK.
Short answer- you don't. Like most of the US, there is no requirement nor means to register ordinary firearms to any one person. Private face-to-face sales of firearms are legal between private parties if both reside in Utah.
Your best course is to find a lawyer who is familiar with firearms law.
The second amendment prevents the federal government from banning private ownership of firearms by legal, law-abiding citizens. In so doing, it provides a balance against the power of the central government to seize absolute control by force of arms.
In the United States, acts are legal, unless there is a specific law making them illegal. A licensed California Private Investigator who also has a Bureau of Security and Investigative Services Exposed Firearms Permit may carry exposed.
World wide, no accurate data available. In the US, most current records are for 2009. In that year, 5,403,714 firearms were made by licensed manufacturers. A small but unknown number of guns were made by private citizens for their own use (perfectly legal, by the way)
Legal today in the US