So last night, I went on a board and someone showed how to modify Browning High Power magazines to be used in the M9/S9 and was wondering if the same would be possible for the M40/S40. I'd seen a thread talking about M&P magazines being a possibility or XD as well. Has anyone done this? 12 rounds in a magazine isn't bad, but who doesn't want more shooting and fewer reloads am I right?