Remington 870 Firing Pin Retaining Pin emoval is one of the procedures which you need to do to replace broken firing pin or firing pin retractor spring.
Firing pin or Firing pin retractor spring replacement is needed if they are broken. Inspect them every time you clean your shotgun.
Here is how broken firing pin retractor spring looks like:
Broken Firing pin:
How to Remove the Remington 870 Firing Pin
1. Knock out the Firing Pin Retaining Pin.
2. Take out the firing pin and firing pin retractor spring
3. Reverse the process.