I figured the bloody thing out. The ejector is attached to the trigger housing. Finally got a hold of Mossberg custorme service and they sent a new ejector, no charge. Reassembly , amazingly enough, was easier than the disassembly. My brother said he had problems with FTE and that some guy on the web recommended filing up to an 1/8" off the front of the ejector to increase the gap from the chamber. I am disinclined in making adjustments until I can discern the problem for myself. In this case, 50 rounds without a single FTE indicates no adjustment necessary. Evidently my brother bought one with a defective ejector.
Another day, another zero. (Alfalfa, Our Gang)