Not in the US, but registry is required for ownership or possession of certain types of guns.
He was charged with two felonies - possession of three unregistered machine guns and two silencers, and possession of firearms by a convicted felon
Depends on where you are, and how recently.
They are not dangerous by themselves. To be dangerous to anyone, a person has to be invloved.
Yes
Is it possible that you mean possession of a firearm? In general, possession means having control over an item. If you hold the item in your hand, or place it in your dresser drawer, you have actual possession of the item. If I have the keys to the lock on a gun safe, I have CONSTRUCTIVE possession of all guns in that safe- I may not be holding the guns, but I control them.
Gun possession
If used incorrectly, yes, they can be very dangerous.
They already are.
Yes!
Unlawful possession is when you have a illegal items ex.(drugs,guns) which are outlawed in your state because unlwaful means against the law.
Here is one. As dangerous as machine guns. Hope this is some help to you. :)