FYI:
I've been reading of a potential issue (I guess more than potential as failures have occurred) with the OEM firing pin.
Folks have had them break and, once broken, the pin can damage the breech face of the barrel.
Here's where I first read about this:
https://thefiringline.com/forums/sho...d.php?t=589484

On Rimfire Central:
http://www.rimfirecentral.com/forums...d.php?t=989473
http://www.rimfirecentral.com/forums...d.php?t=983865 Notice this one is posted in the MK III forum, so it would seem the new design FP is being used in them as well.

There's a thread on rugerforum.com, but it was started by the OP of the firingline thread using the same info.

Regards,
Greg