It depends on where you are. In most U.S. states, you can purchase a handgun from another individual in the same state, or you can go into a gun store. Check the local laws where you are.
no
Well you would have to be at least 18 in order to buy a firearm.
No.
No
Nowhere in the US.
Certainly.
at an illegal firearms store? No one here is going to tell you how to acquire an illegal firearm. It is illegal to purchase a stolen firearm or for a felon to purchase a firearm.
As long if he/her has a licence.
Do you mean a firearm or a paintball gun?
No
In most U.S. states, you can possess a firearm, such as while hunting or target shooting as long as you possess the firearm with permission of the owner, but you can't buy one or own one.
Yes, this is basically the same as buying from the internet. you can buy it and have it be shipped