Samson Manufacturing Corp. Compact Magwell, No-Gunsmithing, Beveled, Black Finish 04-06028-01 Samson Manufacturing's one-piece" no-gunsmithing magazine well brings even more control to Smith & Wesson's M&P Shield 9mm and 40S&W. Beveling on the base of the magwell makes reloads quicker and fumble-free.