Well I have been doing research and I know the M&P 9c accepts the full-size M&P mags. They also offer the small grip adapter. It doesn't look quite as smooth as the full sized M&P with the extension but you would have the option between as many rounds as a full-sized or put in the standard 9c mag to conceal it easier. Just an idea, I was also considering that if I go forth and get the M&P 9c (looking like the top option for me right now!) Good luck and thanks for your post on mine!