I just purchased the 500 12G Flex 28/18.5 combo. It came with the tactical forend that looks like it is designed for you to mount a light on one side, and a laser on the other as there are rails on the left, right and bottom and there are Velcro pads on each side. These pads appear to be for some kind of light/laser that must have a wire attached to a pressure switch on them. Then when you grab the forend, they light up. Where do I buy such lights to use with this existing forend? All my searches have come up with lights built into other forends, but I don't see anything made for this particular forend. Thank you!