I recently purchased an M&P 15-22. I had to send it back due to be fixed the first time, and got it back this week. I went to shot it at the range yesterday and had the the same thing happen again. It's almost like the extractor falls off. So it wouldn't eject the spent brass. I've shot about 100 rounds through it and it has broke twice in the same way. I was shotting Winchester Expert HV ammo through it. Has anyone had this problem?