"I suspect somebody on the web is “repackaging” their “expired tubes” of grease into tiny amount squeeze tubes, at higher prices. Cost them nothing for expired grease, and a fortune to be made for very little labour. "
Perhaps. But my mount doesn't have to pass an FAA inspection. I don't want oval stars, but nobody dies if I get them. The Aeroshell 33MS I'm finding on Amazon in small containers is being marketed to gun owners and builders. Apparently it's particularly good for AR-15s. Maybe someone here has experience with Aeroshell 33MS in that application, and maybe they can explain if and why expired lubricant is acceptable.
As for the Nyogel 788, I have a query out to TAI Lubricants. I discovered that Nye Lubricants' western office is in nearby Oceanside. They have a "Pail, Case, or $500 minimum order policy." Nye's rep in Oceanside directed me to TAI. But TAI's website doesn't show 788. Maybe I'm just not seeing it. We'll see what they say.
Prediction: by the end of the day, I'll have ordered the Aeroshell.