Where can you buy a gun without a license?

Answer 1

In the US, firearms sales are regulated by federal and state laws.

There is no "license" required to purchase firearms under federal law.

Sales between private individuals are not regulated by Federal law, so a person can purchase a firearm privately from another individual.

HOWEVER, state laws vary and must be complied with, and some states require a permit to purchase a handgun whether from a private party or from a dealer.

Sales of firerms from a dealer are regulated and require a background check called a NICS check. This is a one time process per purchase and the record of the check are not kept permananetly, or not supposed to be kept.

so, a firearm can pbe purchased from anyone, there is no 'license", and state laws should be observed.