What are the requirements to obtain a firearm in the united states?

Answer 1

While some states may have additional requirements, under Federal law, you may obtain a firearm from another resident of your own state, or from a Dealer in another state. Handguns must be obtained only within your home state.

You must be of lawful age, (18 for rifles and shotguns, 21 for others) and not be unqualified to own a firearm, and a lawful resident of the US.

When buying from a dealer, you will need 2 forms of identification, and to complete a background check. Disqualifiers include- conviction of a felony, or of a crime of domestic violence, having been adjudged mentally incompetent, being dishonorably discharged from the US Military, being a fugitive from justice, or having renounced your citizenship in the US.

You also need the money to pay for the gun.