Smith & Wesson N Frame Model 27 Classic (27-9 & Up) Hammer Block New Style .357 Magnum — Used (C27120) thumb piece nut and Performance Center models with

and Performance Center models with 4" barrel in 9mm and

This is a used OEM factory part in functional condition

Model: M&P Shield Plus 9mm only

Part Number: 3913J1

Smith & Wesson N Frame Model 27 Classic (27-9 & Up) Hammer Block New Style .357 Magnum — Used (C27120) thumb piece nut and Performance Center models withSmith & Wesson N Frame Model 27 Classic Hammer Block Part C27120 This listing is for one (1) used Smith & Wesson factory OEM hammer block for the N Frame Model 27 Classic revolver (dash 27 9 and up). New style design, black finish. The hammer block is a critical internal safety component that prevents the hammer from contacting the firing pin unless the trigger is fully depressed. Specifications Part Number: C27120 Style: New Style Color: Black