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I have had 8 G19 Pmags for about 4 or 5 years that stay loaded 24/7 365 in my car in 95 degree summer heat, have many hundreds of rounds through them, have never been cleaned and I am yet to have a problem with them. I don't shoot steel, just aluminum or brass.
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I use them for range mags with no issues. Also use the 27 round mags in my AR-9 without issues, although I have not fired it a great deal.
Andy
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They're fine, except with steel case.
Here recently, I believe I've finally worn out one of my training mags, a 17 rounder.
Wishing I'd kept an accurate round count through these, the way I do the firearms, but at this point I've easily put 2,000 rounds through it.
The feedlips tend to wear, on the inside, where the cartridges slide forward out of the mag. This wear let's the rounds position in the top of the mag be at a higher than normal angle.
This mag has recently experienced a feed issue, due to this wear. Only once, and I actually shot some out of it today, with no issue, but I'm keeping an eye on it...thinking it may be done.
Obviously OEM mags don't wear this way, they're metal in that area.
I do particularly like the 21 rounders as well. They've all run 100%, except with occasional problems with steel case, and this recent issue with one high round count mag.
Time will tell.
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I use a few for range mags, mostly 21s, and that’s been fine over a few years. I have a shitpile of training mags, though, that actual use is spread across. Factory mags for carry/work. There’s no good reason to not use the factory mags for real shit.
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I owned a handful back in the day, they would not run well out of my Gen 3 G34. YMMV.
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I have a couple that I use for training but carry Glock mags.
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In my small sample the springs weaken a lot faster than OEM’s.
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Been using them for training mags for a few years now. Thousands of rounds through about a dozen of them, all 17 rounders, with no issues that I can recall. I have only bought them when they were on sale for like $10ea. So it was worth the cost to beat them up over OEM mags. I still carry OEM mags in my main guns.
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I've used a bunch since they were first available. They work pretty well, do have some quirks as described above, and are inexpensive. Mine are contingency/training use only.
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I bought a bunch for range use a while back. Keep them clean and they run for the most part. I've found if I let them go without a decent cleaning after a few range trips I start having failure to feeds.