****UPDATE*****
Polishing, mag changes, mag cleaning, ammo change, spring swap with another carbine and a host of other things and it (and the other carbine continued to work) started working. What made the difference? I really have no idea as a few trips to the range with ongoing failures and I decided to start over and the problem is fixed.

If I had to guess I say it was likely a combination of things but primarily newer parkerizing and lack of a complete lube. I took it completely down and cleaned/lubed and although it wasn't dirty, unusually dry or had any other problems it started working.

Thanks to all for the suggestions and support.

Sincerely,
Bob