It doesn't...

Originally Posted by
jmart
How does bolt lock back play into assessing spring effectiveness? I would think that as a spring wears, the ability to lock the bolt back becomes easier and easier since it's compression dampening weakens over time. I suppose a spring could get so weak it would not offer enough compression resistance and you could end up having extractor issues, but it would have to have got pretty bad by that point that other problems would appear prior.
I would guess that the real test is whether or not a spring that's had many rounds through it is able strip off a new round and ensure the bolt is fully seated/engaged (rebound force).
Here's what he said:

Originally Posted by
C4IGrant
No. The spring would not allow the bolt to strip a round off of a 30rd mag.
C4
This was on his out-of-spec short, 8000 round buffer spring.
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