Originally Posted by M29since14

Yes, it is. Mine has a longer barrel than your gun, but has the same grip pattern (Swiss). The firing pin retainer has a radial "key" or tennon that holds the retainer (with firing pin and spring contained) in place. The "key" was either too soft and could not do its job, or else the part was improperly sized (not enough engagement). The resulting failure made ignition erratic and eventually it failed entirely.