Very helpful article!

BTW the blown-up rifle belonged to Chris Comer (RIP), a shooting buddy, a vet whose father died in WWII on Peleliu, and one of the nicest men you'd ever want to know.

Fulton armory said the barrel was made of a bad batch of steel that was held at too high a temp too long. Consequently, the steel molecules were too big, which eventually caused the blow-up. It was not a high pressure load. That was also shown by looking at the primer of the round in the chamber when it blew up; no pressure signs.

To add insult to Chris's injury, he couldn't replace the rifle as it was grandfathered under one of Kalifornia's goofy AW laws. I'm so glad I left that socialist, leftist hellhole.