What course of action must we seek to close his juvenile record and allow him to own a firearm?

My husband and I were both looking to purchase handguns. However, we learned that he is unable to because of a felony charge when he was 14 years old. He had been told that those records should have been sealed and should not have affected him buying a firearm now. He is 27 years old and has no additional felony charges and/or legal troubles.