I am looking to possibly trade for a NVEC M646 Raptor Optic that a friend has. I have used this unit for spotting in the past so I know it worked well, however it is currently not operational. It appears to have no dammage externally and is complete with hard case and papers. It is out of factory warranty. Does anyone know any experienced repair centers for this type of equipment. I would like to contact them to see about cost to examine and repair device.