I was actually reading about this topic recently. I've been keeping about 10 fully loaded pmags for the last year or so. I also keep a couple XD9 mags fully loaded. A lot of people have said that they do the same with no operational flaws to speak of. And then some avoid it like the plague. From what I could find, however, there isn't a definitive answer to this.
UPDATE: I decided to email Magpul's technical support to ask and this is their reply...
Quote:
Thank you for your inquiry. The factor that truly wears out quality springs is compression cycles, not constant compression. However, we use a high-quality stainless steel springs in our PMAGs and if one ever does happen to wear out any USGI spec spring can be swapped out for the factory one.
We’ve had magazines fully loaded for over four years now with no Impact/Dust Cover on and have experienced no feed lip or spring issues. With the cover installed storage life is considered indefinite. There have also been PMAGS reportedly tested to hundreds-of-thousands of rounds (military vetting), and we know positively of ones that have gone tens-of-thousands, so usable life is quite excellent too.
Thank you,
The Magpul Team
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