It might be less expensive and a lot easier to just buy one of these:

S&W Smith & Wesson M&P9 Spec-Ops 9mm Threaded Barrel NEW! Smith & Wesson Pistols - Autos > Polymer Frame for sale, gun classifieds or gun auction from Harris Sporting. Buy or bid on this S&W Smith & Wesson M&P9 Spec-Ops 9mm Threaded Barrel NEW! in th