The Apex Revolver Firing Pin is made for a wide range of use, from duty/carry applications to competition. The combination of the Firing Pin and the Reduced Power Firing Pin Return Spring is designed specifically to reduce the probability of light strikes, particularly in revolvers with high-performance trigger action work. Works with all modern J-, K-, L- and N-Frame Smith & Wesson revolvers with a frame mounted firing pin. Not for use in Rimfire Model Revolvers. What's Included: 1 ea. Revolver Firing Pin 1 ea. Reduced Power Firing Pin Return Spring Mfg: Apex Tactical Specialties Inc