This Cobra Model Gun is notorious for breaking the original firing pin. Our firing pins are machined from 17-4 Stainless steel and heat treated to an H900 Condition. This improves the shear and impact strength of the pin and also helps eliminate internal corrosion issues and improves the overall reliability. We manufacture all our firing pins in-house on our Swiss Style CNC machining centers. Heat Treated Stainless Steel Does Not require to be stress relieved as all carbon based steels. Even though 17-4 Stainless cost more we use it because we want to provide our Customer with the Best Possible Product and Quality.