Quote:
Originally Posted by Roadranger
I know from experience that a 357Sig barrel will work straight away in a 40 or visa-versa. I'm pretty sure a 9mm barrel will work in a 357 M&P with the 9mm Magazine and possibly a 9mm recoil spring. Bob
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I agree. Earlier this year KKM Precision built and sold to me their .40-to-.357Sig conversion barrel (4") for the M&P 2.0 and it works just fine.
I recently checked their website and discovered that KKM also makes and sells their .40-to-9mm conversion barrel for the M&P 2.0. Here's the link:
M&P Compact 2.0 40S&W to 9MM (4.0″ Model) | KKM
Email from KKM confirms this is a drop-in barrel - no fitting needed. Just drop in the barrel and use 9mm magazines.
I'm buying one of the .40-to-9mm barrels so I'll have all three calibers covered with one chassis.