Received the Racker and installed it yesterday. Very impressed! I've got a 12" Norinco 870 clone and I was a little worried about modifying the forend to fit but to my surprise the Racker went on with zero issues. I had a Hogue forend on there previously and it definitely required some fitting. No so with the Racker. The design of the Racker has a split seam right down the middle of the interior part of the forend which allows the forend to easily fit/stretch over the oversized mag tube. It fits perfectly and is plenty snug. It's well built, very comfortable and secure in hand, easy to operate, and VERY bright for "only" being 200 lumens. I have a number of Acebeam and Fenix lights in the 200-300 lumen range that don't seem as bright as this. The forend does add a little weight to the front of the shotgun but I actually really like the balance.
Overall I am very happy with it. I haven't put any rounds through it yet but I will report back when I do. I highly recommend this setup.