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If you multiply the rifle's probability of a failure on any given attempt times the probability of actually needing to use the rifle in a defensive situation, the resulting overall probability represents what I, personally, would consider an acceptable level of risk.
Now, if I knew that I was going to be shooting it very frequently in situations that matter to me (either competition or combat), then I could see the value of using guns/parts that have undergone some extra scrutiny and testing.
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