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What I'm wondering about is whether the same metallurgical problem pertains to the Taurus version of the Beretta design and whether the "locking block" actually broke in your example, or perhaps it was really the slide breaking at that point. If I recall correctly, the locking block is only subject to compressive forces.
A local dealer had a sale on Taurus PT-92s, and while working range duty at the local gun club, I saw four of them come through.
Two of them worked fine.
One was a jammamatic.
The fourth example fired ONE shot, and the slide only came back a little bit. With some difficulty, the owner field stripped the pistol, and the locking block was cracked in half. No other damage - slide or anything else - was evident. This was with factory Winchester USA ammo in the white box - I've personally fired many thousands of rounds of this stuff with exactly zero issues.
As for Beretta slides breaking - IIRC, that was after MANY rounds were fired.
Still shouldn't have happened, but it wasn't a "first round failure."