How does a gun fire on its own?
Basically, it doesn't. A gun is an inanimate object, not capable of movement of its own accord. Your car does not start and drive to the gas station, your lawnmower does not start up and cut grass without someone doing something, like turning a key, pressing a switch, pulling a starter- or pressing a trigger.
It depends on what you mean. You can fire a gun anywhere, however, it may or may not be legal depending you where you are and what the local gun laws are AND it may or not be safe, depending where you are. Check your local gun laws and be sure you can safely fire the gun without damaging any property or other people.
No. You can not own a weapon of any kind. You may remember you signed an agreement (A CONTRACT) before your release from prison or jail or probation. You can NOT own any Rifle, Long Gun, Short Gun, Hand Gun, Pellet Gun, Blow Gun, Air Gun, Cannon, Black Powder Gun, Crossbow, Bolts, Ammo, or any kind of gun. However, you may own a Bow. -Walter