I'm not sure how it happened.
The extractor would have had to move inward or outward quite a bit to release the ball. When chambering a round the extractor only moves outward enough to jump the case rim then returns to engage the extractor groove but the ball doesn't ever clear the extractor detent. It almost had to escape captivity prior to chambering the round.
In any event if he needs a replacement check any local hardware stores, bike shops and etc for a .140" (9/64") ball bearing to replace the factory .125".
Bill
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