Up for sale is a KKM Precision match barrel for the Smith & Wesson M&P 9mm full sized. KKM makes high quality barrels. I didn't see barrel length listed on the KKM website, but this is listed for the full model which S&W equates to the 4.25" barrel, not the longslide 5" or compact 3.5.The item "Smith & Wesson M&P Full Sized 9mm KKM Precision Match Grade Barrel" is in sale since Tuesday, August 15, 2017. This item is in the category "Sporting Goods\Hunting\Gun Parts\Pistol". The seller is "parapuke034" and is located in Kingman, Kansas. This item can be shipped to United States.