They wanted ALL of the ammo so you would have no further evidence if you wanted to have independent tests done.Unfortunately, no they insisted it was an "out of battery" incident. They did require that I send in my whole lot of ammo to test for over pressure issues and they replaced the ammo.
This was my VERY FIRST AR! I paid $300 for it at a gun show from a guy just walking around with a for sale sign on it. I shot the heck out of it for well over 20 years and finally sold it during the last gun scare for $1,600!