I have never owned one and while it does seem to be a clever idea I have read quite a few reports (some from LEOs) that the stock can inadvertantly release shells just from recoil or impact with a solid object. (door frames, the ground, etc.) I do have an 870 set up with Speedfeed synthetic stock (with no shell storage) and forearm and like it fine. I carry extra rounds in a buttcuff attached to the stock's right side.
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