Yes
Air Soft guns. Yes
Yes, with the appropriate licensing from the federal government.
You need to consult with a lawyer for a current/correct/legal answer.
Not usually. Machine guns are legal in most states, but not legal for hunting in all of those states. Plus, many states have a limit of the number of rounds allowed in a gun for hunting, usually 3 or 5.
The Atlanta PD can give you the up to date status on current laws.
Yes, provided you follow all the local, state and federal laws.
No. Machine guns will beat Gatling guns.
Machine guns.
If you are speaking about Phoenix Arizona then the answer is yes they are legal to own. In fact one of the largest air gun dealers on the web is located in Glendale AZ.
Yes, machine guns are better than Gatling guns because they fire more bullets faster than Gatling guns. Gatling guns need to have bullets and have to be hand cranked at the same time but machine guns does not need to be hand cranked. Machine guns only need bullets.
Yes, machine guns were used in WW2.