The assault rifle with a silencer was discovered after flooding and handed to the police.
According to the Austrian Press Agency the weapon should have been destroyed once it was decommissioned, and it is not known how it fell into Huber’s hands. It is forbidden for private individuals to own former army guns.
After being questioned by police for poaching Huber went on a murderous 12 hour killing spree - shooting dead two policemen, a paramedic, and a member of Austria's counter terrorism special operations unit, known as Cobra, on September 17th, 2013.
He then barricaded himself in a farm building near Melk and shot himself in the head.