Chuck is right, you dont want to chip the stock. I have had some pads pull of easily in the past though. You could try to heat it like Mr. Campbell said. This way, you will now if it is on their good and tight or if they did indeed install it with epoxy and anchors. If all else fails, like Chuck said again, cut it off as close as you can then sand it down, removing screws or anchors if they exist. I am also curious as to what gun you own. Let us know how it goes!