I have a S&W factory 9mm 4.25" barrel for the full size M&P pistol and two ProMag 17rd Magazines that I don't need. I bought them to convert my .40 S&W. I installed the barrel, fired a half dozen rounds through both magazines for function and put them in the cabinet. I wound up buying an M&P 9 so I never used these. $150 shipped to your door.