if you can take the stocks off you could tap and mount an accessory rail to the fore grip. Rails can be bought for various amount depending on their size but I think you can get some from NcStar. I use a MARS rail from them I fit it on my HKSG1. I know its a little ghetto but its highly functional and cheap. In you case I don't even think you have the $150 dollar alternative. With the rail installed you could mount any picatinny device, such as a bi-pod or a vertical grip.
Good luck
mateba
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