That is the point of the Failure Mode Analysis. For me its fairly easy. When my parts fail they don't cause injury.

I've heard of KaBooms, but mostly for Glocks/Handguns/etc... I'm not trying to downplay, I really just don't have the info--but I bet these companies do!
The important thing is there are 2 areas to be explored: (1) Failure rate and (2) Failure Mode. Just because you have a low failure rate, if your failure mode is catastrophic you have to be much much tighter on your failure rate.
That's why I added my caution in there about
how the parts fail and what they do cause. If it can be shown that a failure, even a single one would cause serious injury, well then test every part. Airline failure parts are 100X less (or more) than what I have, and yet I get away with sampling all the time. They can't even have a single failure and are X-raying parts even after they leave the factory.
If you are out a $300 barrel or $1000 rifle, that's one thing.
Lose a hand or an eye (or a life) that's another. That's why it is important to understand what happens if a barrel passes on that would have been caught. I'm just not familiar enough to say what would happen. Sounds like a few people here are so feel free to comment. As I said, playing a bit of devil's advocate. The more I study this the more I'm not liking batch testing.
Failure rates in airlines are around PPM and they still test every one. Like I said, 1 part fails and you have death and destruction. The same could be said for a rifle. You won't have 100 dead, but 1 injury is enough to get lawyers involved.
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