Well pleased - Stormlake Pistol Barrel for SLK Conversion Barrel Smith & Wesson M&P Pro .40S&W-to-9mm 5.01 Inch Stainless Steel 34149

Just bought a 5" ported slide kit for my M&P 40 and bought this barrel to convert it to 9mm (even though not ported). Was able to get out to the range to test fire both. It fir and performed well. Due to the wet conditions of the range I was not able to put out targets but I estimate that the point of impact of the 9mm 115 gr ball was fairly close to the S&W 40 180gr ball. At 25 yards standing I was hitting pop cans with either caliber with the same point of aim.