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Another thing, an AR/M16 needs to be lubed generously. Don't dunk it into a barrel of oil but the "drop of oil here and there" isn't enough to keep one running under heavy use. If you shoot one round clean the rifle if you shoot a thousand rounds clean the rifle. When I was in Vietnam we cleaned our rifles every night if it had been fired that day or not. I never had a problem with my rifle and none of my squad had problems with theirs.