I'm waiting on KKM's 5" 357 Sig barrel for my 40L. They keep saying 2 more weeks.... Storm Lake doesn't make one in 357 for the 5" M&Ps, so I wait for KKM. My reason for aftermarket barrels is caliber conversion. I'm a big 357 Sig fan and like to shoot 357s in the 5" 40s. I've had very good experiences with Storm Lake barrels in a Glock 35, an XDm, and a Kimber 1911. Accuracy improved with the Kimber and Glock, and stayed the same in the XDm. I'm hoping for good performance from the 5" KKM M&P barrel, if I can ever get one......

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Tom
"Panem et Circenses"