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The pistol grip from the 870 on the Mossberg would be too far back to use. Check out (w)ww.districorp.ca they are a Canadian distributer of Advanced Technologies www.atigunstocks.com shotgun stocks that fit Remington , Winchester,and Mossberg but they make a stock that fits a Mossberg and add adapters to make it fit Remington or Winchester. An idea might be to sell your Remington stock and buy a CHOATE , BUTLER CREEK or ATI STOCK. The Choate top folding and Butler Creek side folding both on 870's are quite good for what I use them for , I have no experience with the Advanced Technology stocks.