convicted felon with firearms

Although I do not practice law in the State of Georgia, here are my initial impressions.  Anytime you suspect that anyone has committed a crime, you can "turn that person in" by filing a police report.  This can be done as simply as calling the police department and telling them that that you want to report a crime.  Before doing so, however, I suggest that you consult with an attorney to eliminate the risk of unexpectedly incriminating yourself when you file the report.  Unfortunately, however, it is impossible to determine what the penalty will be at this point in time.  The penalty that an individual receives (assuming that they are convicted) depends on a myriad of factors, and at this point (prior to even filing a police report) it is impossible to accurately predict this individual's potential penalty without more facts.  However, when you consult with an attorney with respect to turning this person in I'm sure that the attorney, based upon the additional facts that you are able to provide, will be able to give you at least an estimate with respect to this person's potential exposure.

Call the police.  But don't expect much.  I'm not a Georgia lawyer, but my research suggests that it isn't illegal for a convicted felon to own firearms.  He can't get a carry permit, which means he can't walk down the street with a loaded gun.  But you don't need a carry permit to have a loaded gun in your car with you, in most cases.