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[–] OldTrux 0 points 11 points (+11|-0) ago 

Most good springs will not "take a set" either fully loaded or empty pretty much indefinitely. They will begin to weaken as you cycle them over and over. It is cycles that wear them out, not leaving them alone. Back when I was doing a few hundred rounds a week, I had magazines with several hundred cycles that still worked fine. The springs were noticeably shorter/compressed than a brand new one once removed, but if did not seem to affect function.

That said I would keep newer spring sets in the magazines that were used in competition and carry just for piece of mind.

The magazines I used were also high quality magazines from Wilson Combat. I would expect the same results from any modern manufacturer.

Don't over think it.

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[–] MaxBoivin 0 points 4 points (+4|-0) ago 

That is the correct answer. Springs get used (and wear off) when they contract or expand, not when they remain contracted or expanded.

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[–] ilikeskittles 0 points 1 point (+1|-0) ago 

This is what I was told. I called Magpul about it, they said exactly what you said above. I keep half a dozen AR-15 Mag's loaded all the time in a ready bag. They told me that was not a problem at all.

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[–] OldTrux ago 

I'm sure they did. Magpul makes a good product and I'm sure their standards are very high.