I picked up a new M&P .40 pro recently, and like others, i cant find any mags for it. This gun is for USPSA limited division. I have enough 17rd mags that i am thinking about trying to modify one to work with the .40. Has anyone tried this? Ive already order a couple .40 followers, the mags measure almost exactly the same except the feed lips, they would need opening up a little. Would like to hear any first hand encounters on this.