Smith & Wesson J Frame Model 37 Airweight Hammer Block Old Style .38 Special Used SW99 Series 31 K-Frame

31 K-Frame

4 Retaining Nuts

The K Frame is a medium-sized frame

Contact USA Guns And Gear for expert assistance with all your Smith & Wesson parts needs

This screw secures the internal gun lock mechanism that is standard on modern S&W revolvers

Smith & Wesson J Frame Model 37 Airweight Hammer Block Old Style .38 Special Used SW99 Series 31 K-FrameSmith & Wesson J Frame Model 37 Airweight Hammer Block Old Style . 38 Special Used (Part# J3710A) This listing is for one used Smith & Wesson J Frame Model 37 Airweight hammer block in the old style configuration. This is an OEM factory part in used condition, removed from a functioning firearm. The hammer block is a passive safety component that prevents the firing pin from contacting the primer unless the trigger is fully depressed. Note: This is