
Originally Posted by
rsilvers
That test is next to useless because essentially all bolts pass it, and a tougher test would be too destructive. Many of us have bolts in our ARs right now with thousands of rounds on them that would fail MPI if tested today, yet we still keep them in our rifles. AR bolts crack with use - they just do. We know today, but maybe not 50 years ago, what that means in real-world terms - that the bolt should be replaced at 5000 rounds for super hard use, or 10,000 rounds for typical use, or when it fails if we don't really care.
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