John,
This appears to be a design flaw. This looks like it could happen to ANY R9 as the firing pin retainer can be moved or slip to the left. With the power of a 9mm round it this small gun, what would stop this from happening again? I certainly would not want this to happen when I was in a real life situation. Take a look at the way the retainer is set in your gun, and you will see it can move to the left on any R9 and go out of spec, even if originally in spec.