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I do believe dust covers, at least for use on civilian ARs, are somewhat over rated. I live in the desert Southwest. I've spent over 60 hours in training courses with my AR-15. Those courses were all conducted in the rather windy desert. There were days when the wind blew so hard it was tough to stand still enough to put a bullet on a 50 yard target. Needless to say the dust was blowing a LOT during those courses. While my M&P15 OR has a dust cover, it was only snapped closed at the end of the training day, about 15 seconds before I put it in the gun case....the rest of the time it was open. I suffered no performance issues.
People can "want" anything they like....but that doesn't mean it is "needed" in order for something to work. YMMV
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