I was skeptical, but it is perfect! - Stormlake Pistol Barrel for SLK Smith & Wesson M&P Full Size Barrel .357 SIG 4.25 Inch Stainless Steel 34116

It dropped right in, fit perfect and functioned even better. Great product, PERIOD! I was concerned that the barrel would have to be fitted by a gunsmith, but as the manufacture stated, no fitting was required. I highly recommend this Stormlake barrel and I will buy another on if given the opportunity. Finally, OpticsPlant had a great price and prompt shipping. I will use them again.