OCALA, Florida, July 30 -- The U.S. Attorney for the Middle District of Florida, Maria Chapa Lopez, issued the following news release: A federal jury has found Mark Charles Barnett (50, Ocala) guilty of attempted arson, possession of an unregistered National Firearms Act (NFA) destructive device, and making an unregistered NFA destructive device. Barnett faces a maximum penalty of 20 years in federal prison for the attempted arson count and up to 10 years in federal prison on each of the destru  more