All firearms sales are final. It is a customers responsability to follow all Federal, State and Local laws. There are many websites and agencies that can give you information about firearm laws that will be adhered to when transferring a firearm. Here are a few:

www.atf.gov - The Bureau of Alcohol, Tobacco, Firearm & Explosives (ATF) official website

www.nraila.org/gun-laws.aspx - An NRA website that has firearm laws and regulations by State

www.atf.gov/content/firearms - The ATF website that handles the state laws