I personally wouldn't worry about it. Some AR's don't even HAVE a dust cover. Where do you hunt? A desert? In mud puddles? How's enough stuff going to get in there and make it fail? Cool upper, BTW. Never seen one like it.
I don't see what the problem is. Everybody is being nice, and getting along, and I, for one, am learning stuff. So, if you don't like the discussion, don't look at the thread. Or, simply cut to the chase, and close it.
Is there an age limit for a thread, after which we kill it?