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I have one for everything I have that has MLOK and they are very nice and tuck the light in nice and tight. I used to run the magpul offset mount and this is way nicer. The other nice feature is that there is some adjustability form side to side to move it away from other stuff mounted at 3, 6, 9 and 12 depending on where you mount your light.
You basically remove the mount from the light, a back plate goes in from behind and screws into the light base. It is low enough that I had to remove a small amount of the forend's raised edge at the front to accommodate the light's bezel.