Acually this one's the one that holds the trigger plate on. On the blown up photo from the P99 FAQ it doesn't even have a number. If the hole opens up a new pin wouldn't help, but it was a bit snug being pushed back in. I've only got about 2500 rounds though it so far too. I'm gonna keep my eye on it too, if it's worse, I'll send it to Walther under warranty.