A. start with the firing pin collar, and make sure its OD is the same as the ramp of the bolt.


If OD of FP stop collar is proud of the carrier ramp, pull the FP, chuck the back end in a drill, and spin file the OD of the collar down to get it to flush with the ramp edge.


B. If you have a top L cut hammer, then may need to radus the edge of the bottom L cut edge, so the that edge is not catching the FP stop collar as the B/C is moving back home.


Don't go buck wild, since we don't want to move the top of hammer pin pad on the hammer much lower, but just enough so you don't have that sharp edge on the bottom of the top L cut.

As for firing pin retainer, when you install it, it center slit should be in the direction of the FP travel.  The means as the FP does slam back on it at back of stroke, it hitting the strongers parts of the retainer surfaces since it the widest of the metals, instead of the slit aimed up and down, which allows the pin to bend more isntead since the two pin metals are thinner in this direction.


Simply, the real problem is the distance from the trigger's pin center line of the hammer, to the front of the trigger begin too short, which does not have the hammer lowered enough on trigger hold to keep the FP from catching the hammer top L cut slot.  So the mods above will solve the problem, or if you don't want to mod, then need to replace the FCG with one that the trigger is the correct length to hold the hammer down far enough (if the problem is not the lower receiver with the pin channels not in the correct locations isntead).