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

I installed this barrel in about 2 minutes,fits like a glove. More accurate than my 40S&W factory barrel. No jams so far, shoots flawless. Fun to shoot, cheaper to shoot, and has less recoil than my 40S&W. I did have to buy 9mm magazines. I highly recommend this barrel. My only con is I wish the 9mm etching was larger and on top of the barrel instead of on the side, less confusing.