Just in case I wasn’t clear, you need to find your state’s statute that obligates the state to return the gun to you, which will require signing-off from FR and doing a little research in your state’s criminal code; and then set the matter for a hearing, while filing a petition, probably using the criminal cause number.
The persecutor may call you and ask you to come get it, just to get the matter off his docket, unless the gun is needed for the dirtbag’s appeal.
But from what I’ve seen here, you should either hire a lawyer or kiss it goodbye.
Do it or get off the pot, in other words.