I first checked the Mossberg store but only found the front swivel that attaches to the mag cap, NO screw in stock atachment. If anyone knows the part # I would appreciate it. Otherwise if you know a good aftermarket kit that screws into the polymer stock please post the brand and model. I found a couple of no brand on ebay for 16$ but they look very chineesium & subject to break too easy. However if they work & sturdy do tell. Thanks fellas.