I just wanted to give an epilogue to my experience with USA Ammo. As I had posted on page 7 of this thread I had a very similar kaboom with my M&P 15 with USA Ammo. 223. After my kaboom I sent my rifle to S&W. They analyzed it and found the fault to be with the ammo. S&W then forwarded the rifle to USA Ammo. They found the same thing and took responsibility for the malfunction. During the whole time I was in contact by email and phone with reps from USA Ammo. They were very reassuring and in no time sought to escape or deflect the blame. In the end they purchased the rifle at the full price I paid for it. I got the check today. I was really happy with their customer service. It took this long to be reimbursed because of the fact that my rifle went to S&W first. I don't know if they ever found the problem that caused our kabooms. But I have scoured the gun and rifle forums and haven't found any other reports of problems with USA Ammo. Because of their response to my problem and my past experiences with USA Ammo I am going to get more ammo from these guys. I'd like to support a small American company that treats their customers so well.