Well, I contacted FN and Bob Ailes asked me to call him. He said that they think there was some ammo which was manufactured with the wall thickness too thin. He said that they thought they caught it in time before any of it got out, but evidently, at least one round got past them. He asked me to return what I have left in the case and they would send me a full case to replace it. I'm very impressed with their customer service. After I first purchased my PS90, I had trouble with 2 of my magazines feeding properly. The round would not rotate a complete 90 degrees, but would stick in the mag at about 45 degrees. They quickly sent me 2 new magazines and all has been well since.