I bought the S&J one from OST. Nice machining and finish on the unit, but I have a few nits to pick with it. Firstly, the screws holding the bracket that centres the forearm on the mag tube are silver (stainless ??) which kind of look unsightly on a black unit. Also, they are not countersunk so they stick up. Not functionally of any consequence, but for a $200 rail this should not be. Secondly, the forearm was wobbly when installed with only the mag extension holding it in place. Had to shim it with a sling mount bracket which tightened everything up nicely. Saves me from having to purchase some kind of rail-mounted sling bracket, but if I didn't have the bracket lying around I would have had to fabricate something out of a washer or the like. Other than those points, I quite like the forearm. Just waiting on some XTM and ladder covers I ordered from Fabsports to complete the build.