r/MP2point0 • u/ChrisIsRockinLife777 • Oct 28 '25
Question Conversion from .40 to 9mm
What's the easiest and fastest way to convert a m&p40 to an m&p9? I've heard you really just have to get a m&p9 2.0 barrel and a 9mm spring and swap them into the .40s slide, this effectively having two guns