Hello Guys
I have a M&P CORE in 40 cal. Has anyone tried a 9mm conversion barrel in a M&P CORE in 40S&W to 9mm. Were to get the 9mm barrel ?

The Core slide is identical to any other M&P full size so any .40-9mm conversion barrel will work. KKM and Storm Lake are probably your best bets, stock barrels are cheaper but harder(actually close to impossible) to find.

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Minimize the variables

I have a Storm Lake Barrel. Fit and function are great. No complaints. They have several options such as fluted or not, threaded, etc. Would buy again. I just had my local gun shop order it for me. They don't stock it. They ordered me the 4 inch the first time and mine is a 5 so they currently have a nice 4 inch 9mm barrel on the shelf. They just reordered me the correct one at no cost obviously.