From WSBRadio.com:

When Doraville received the tip they contacted the Bureau of Alcohol, Tobacco and Firearms.

“Because the weapon had not been delivered,” Callaway says, “it didn’t meet their threshold for a crime.”

Mann was dismissed from the Doraville police department.  He can appeal his firing.

Would a civilian like you or me not be charged if we tried to sell a Class 3 weapon without the proper paperwork? It is my opinion that there should be no such thing as a Class 3 weapon in the first place.