Some states require all private transfers to go through a licensed dealer (FFL) to run a background check.
When in doubt, use an FFL. For a small fee (usually $25–$50), a local gun shop can "transfer" the gun for you. They handle the paperwork and background check, giving both parties total peace of mind. buying a gun private sale
Use online databases or local law enforcement resources to ensure the gun hasn't been reported stolen. Some states require all private transfers to go