I recently built my first AR a few months ago for my son. I figured the 6.8 would make a great low recoil hunting rifle. I really have little experience with ARs outside my Army days. Well, got to the range today and the first shot was fine but the empty brass didn't eject. I cleared it, fired another round, and it also didn't eject the brass. After taking everything apart, I realized the extractor was broken. The rifle has only 200 rounds through it. I'm wondering if it's something I've done to it, or done wrong, or is it just bad luck and a part that is known to occasionally fail?