On my Gen 4 21. Was cleaning it today and saw the sharp piece of metal hanging off the frame behind the slide rail. After looking at the slide plate cover that covers the firing pin I noticed the cover plate wasn't in the whole way and hanging slightly below where it should have been. Took the cover off and removed a small piece of plastic in the groove. This came off the cover plate. Cover plate fits the way it should now. The round count is 206 and with the slide cycling and the plate cover not in the whole way it caught the metal. Gotta call Glock tomorrow and send it back. Anybody ever deal with something like this?