Dremel/grind the front of the 870 SGS stock flat. Dremel out the .500” hole to .750” to fit the receiver. Drill out the channel for the connecting bolt to 9mm. Dremel out enough material to fit the head of an 8mm machine screw in to the slot on the top of the stock (I had to hollow out the inside a bit and then tapped the head with a small hammer to pop it in). Fill voids inside the front of the stock with a small amount of JB weld. Reassemble and you’re done. A few hours, max.
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