How about looking into selling the folding stock on ebay? You might be able to sell it off at a nice price (60-90 bucks was the last price range I have spotted them topping out at). You can use the money made there to buy a walnut stock (870 Police Magnums have walnut stocks if I am correct) from Gun Parts Corp. (frequently advertises specials on 870 stocks around 30-40 bucks) and a stock screw and buttplate w/h screws.
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