I have a variety of guns in my safe....only the AR-15 platforms have dust covers....none of the other rifles and shotguns seem to be the worse for ware because their bolts are exposed to the elements. The only time the dust cover on my ARs are closed is when they are sitting in the gun safe....and does it really matter then?
IMO, too much is made of the Sport's dust cover and forward assist. I've seen more folks lock up their AR-15 by pounding on the forward assist than I've seen actually "fix" the problem....especially those using reloads or substandard ammo.
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