It's a common thing that many of us notice, but doesn't happen on every single P-07 or P-09. It happened on one of my P-07's but not the other. The good news is it isn't a real problem, from my experience and based on what I have read here. Knock the burrs off with a file if they're bothering you while cleaning it or whatever. It shouldn't progress any further or affect the function of the pistol.
