The TACCOM 9mm PCC Firing Pin with spring is hands down, going to be your best chance as a “non-breakable” firing pin. We chose to use 17-4 stainless steel because it’s stronger and tougher than s7 tools steel; which is the common material used in firing pins right now in the market.
• Made out of 17-4 stainless steel
• Heat treated to Rc 42
• No sharp internal corners
• Stress relieved
• Works with Taccom, Faxon, and Surmount bolts