Unless you get an attorney involved in clearing your record with the feds, you shouldn't even be able to PURCHASE a firearm, let alone carry the thing concealed. And with recent events, any attorney you get had better be high caliber. Expunging records for felons who want to purchase/carry firearms right now, regardless of how insignificant the felony might have been, could be a real career killer for a judge.
"...I advise the gun. While this gives a moderate exercise to the body, it gives boldness, enterprize, and independance to the mind... Let your gun therefore be the constant companion of your walks," Thomas Jefferson