Nelson & Lawless | Terry Nelson
It is a federal and a state crime to not properly transfer ownership of any firearm. You could contact your local gun store to inquire about the current rules and documents required to transfer a shotgun between family members. Many people hand on guns to family members without any paperwork, since they can be sure the gun is not stolen or been used in a crime, or being used in a sting to catch and arrest the parties in the transaction. The paperwork on shotguns does not provide for the serial number to be given to the state, so your choice whether to do the paperwork or not.
Answer Applies to: California