Very good points.
I was thinking of The Strength of the "ears" that contain the front pivot hole in the replacement BB.
The BB measures about .545" wide with about a .250" center extractor cut, leaving about .145" wide ears with about a .150" margin around the .230" diameter pivot pin hole.
i would not like the 'ears' to fail in Tension loading from firing my rifle. it would make for a Very Bad Day indeed!
I do admit the 95ksi yield strength estimate is better than 1010 Steels; but thought ~160ksi yield would give a larger margin of safety.
Best Regards,
Chev. William