Smith & Wesson J Frame Model 640 .38 Special Hammer - Stainless Steel Old Style J640107 4013 Part number M659S

Part number M659S

If no model number is present

The hammer block (also called the safety block or hammer stop) is a critical safety component that prevents the hammer from striking the firing pin unless the trigger is fully pulled to the rear

2 Lock Washers

Smith & Wesson J Frame Model 640 .38 Special Hammer - Stainless Steel Old Style J640107 4013 Part number M659SGenuine S&W Model 640 Hammer Assembly Old Style This genuine Smith & Wesson hammer is designed specifically for J Frame Model 640 revolvers chambered in . 38 Special. Manufactured from durable stainless steel, this old style hammer component ensures reliable ignition and consistent performance in your classic revolver. Key Features: Genuine S&W Part: Factory component ensures perfect fit and function Stainless Steel Construction: Corrosion resistant