I buy local for mine. I can get the chance to inspect it myself. I look for two major things. I make sure the stock has no cracks in it. I also check the bore. All that I have seen have had very strong rifling, and clean bores. Dark or shiney I do not care as long as the rifling is strong. When I buy one I take it to the range with a mallet, and drift punch to set the front sight to shoot straight without the bayonette on it.
My newest one shoots 2 inches to the right at 25 yards without the bayonette so I will be working on it today. (Forgot to take the mallet, and punch yesterday.