Just got my three 10rd mags that I ordered they were out of 12rd mags. It took me about 2 min to convert them to 12 rounders. Just used this youtube video. Allright! I'm ready for the range now, I've got 4 mags now and a 525 box of ammo. Range report when I get back.
M&P 22 +2 mag modification - YouTube
M&P 22 +2 mag modification - YouTube