I read and heed a lot of info on this site. I currently have 2 DD's, 2 BCM's, and a Larue bolt and carrier group. The Larue has had the most rounds through it and I really can't get that excited about worrying about anything Larue sells. I did notice that at after about 1000 rounds weak extraction was occurring, causing FTE/FTF and I put in the spring, buffer, and donut that EAG gives out from BCM at his classes. Since then another 400 rounds without issues.