You might want to give these two links a look if you own a Ruger MKIV pistol. While I haven't seen any official word from Ruger, it seems that there is a problem with the design of the new firing ping in the MKIV pistol.
https://thefiringline.com/forums/showthread.php?p=6509000
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http://www.rugerforum.com/phpBB3/viewtopic.php?f=32&t=259354&hilit=firing+pin
https://thefiringline.com/forums/showthread.php?p=6509000
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http://www.rugerforum.com/phpBB3/viewtopic.php?f=32&t=259354&hilit=firing+pin