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?

TIA

When I had one it required a conversion barrel (KKM was my preference) and 9mm mags. That was all. Mine actually worked and cycled pretty much flawlessly.

Mark in GA

You can use S&W 9mm barrels. They don't fit tight, but the guys over on the S&W claim accuracy doesn't suffer much with this setup.

I’ve got a KKM 40-to9 conversion barrel that’s been perfect.

Thank you, gentlemen. I see that Storm Lake and KKM are essentially the same price, any reason to choose one over the other?

I’ve had both in several calibers. Prefer KKM myself.

Mark in GA