Time Precision twin firing pin bolts
I had four Time actions that came with twin firing pins. They all performed well.
I was told that the action would perform better if I filed down the 12 o'clock pin so that only the 6 o'clock pin struck the rim head. I tried this on two of the actions. Never could tell a difference.
Although it sounds like a great idea, striking the case head on two sides at once. In reality if it helped at all I could not detect it.
Hope this helps!