Dust covers on AR's are something I give little thought to.... Keeping Foreign matter and debris,etc out of your AR is always a good thing. The cover was designed to do that.. SO I use it. And if you ingrain it into your shooting, it's something you sub consciously do with out any thought. Doesn't matter where you are.. Dirt,dust,mud,water..seaweed,treebark,woodchips,etc... I know of no geographical location on the planet that is more suitable for AR's with out dust cover's,vs. AR's with them.
As to weight savings....Download your mag by 1 bullet... there.. you just compensated for the dust cover...
Worrying about Dust and dust covers and how much dust is to much is entering into the realm of Minutia
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