I'm sure I've read something here about switching calibers in the M&P but don't recall specifics. I have a full size M&P 40 (not 2.0), what's it take to make it a 9mm? Barrel and mags of course, but what else? Are the barrels drop-in?
"Jimmy, some of it's magic,
Some of it's tragic,
But I had a good life all the way."