Like BAR stated, I also fired thousands of rounds in M1icon rifles with the round firing pin. The manual said to always replace the round firing pin - but
did not state the reason and most shooters never bothered to replace it. It could fracture near the tip and lodge the tip in the bolt face or just break
off leaving a two piece firing pin too.

You will or your gunsmith will, have to take your bolt apart anyway to get an accurate headspace measurement with gages that are known to be
correct and not well worn military gages found at gun shows.