Mine was a 9mm V3 P30, I called H&K and they told me that is quite normal and didn't effect the performance of the gun. My friend at the range has a few H&K's and he only has that issue on 1 of his firearms, can't recall if it was the P2000 or the P30. Again, I'm not here to bash the H&K, they are great guns, I own a P7 which is one of my favorite firearms. I loved the ergo's on the HK but just couldn't get over the rattle. Personal preference.