I don't know and haven't heard anything about a porcelin barrel of any type.
One non conventional barrel that is being tested, and we had a couple in the shop, was a new AR bull barrel out of a shop in Oregon that is almost 85%-90% carbon fiber and weighs about 1/2 to 1/3 of what a traditional AR GI barrel weighs in a non bull configuration.
Haven't seen anything announced by anyone picking them up or anything like that, but there is technology out there that people are testing, so I suppose it's possible.
If you end up finding anything that is worth a damn, please come back and let us know.
JD
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