If you only plan on having one AR and keeping fit or a life time . I would recommend chrome lined or melonite coated . You should get double the life with those coatings . As for the dust cover and foreward assist sure why not . If your looking to save some money , thats cool . I assume your looking at the M&P 15 sport . I have heard nothing but good things about that rifle .
Why do I carry a 45 ? because they don't make a 46