Idaho does not prohibit possession of either a semi-automatic rifle, nor a fully automatic rifle (machine gun) Fully automatic firearms are regulated under Federal law in ALL states. Possession of a fully automatic firearm is legal in Idaho so long as the gun has been registered with the Federal BATFE.
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.
Yes
no, they arent legal anywhere in the US.
Yes, in accordance with federal law.
It depends on the gun and caliber but most semi-automatic rifles such as the Ruger .22 are legal to hunt with in California.
You would have to define "kit"- but if you mean components to convert a semi auto to a full auto- No.
Yes
Yes
AK-47 models are not fully illegal, it's that the fully automatic variants are restricted to military usage and thus a typical civilian cannot get easy ownership of such rifle. However, semi-automatic versions are legal for civilians to own. If you live in a place where semi-automatic rifles aren't restricted, then you're in luck to getting the semi-auto AK-47.
If you mean in crimes in the US last year, there were 323 people killed by ALL types of rifles. There are no separate records of semi-auto rifles. If you mean legal fully automatic rifles, none. See the FBI Uniform Crime Report for accurate information. There is some VERY wrong data that is being published by others.
Yes- if registered with the BATFE and with the State Police.