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Answer: No, no, and no.
For you intended purpose a sporter rifle sans forward assist and dust cover would be fine. I do use my forward assist regularly after performing chamber checks, but there are other ways to chamber check and I've never needed the forward assist otherwise. A dust cover and chrome lining would be nice for a rifle intended for mid-to-long term survival as you indicate, but if you maintained your rifle well there would be no need for either.
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