That looks like a fun day. Only have one thing to critisize though... Check out the "chicken wing" on your brother as he shoots the rifles... He really needs to work on that.
What brand AR15 is that anyway?
I had a failure to feed with my brand new Glock 21 (.45 ACP) a few months ago. It was the Wolf ammo that caused it. Since then (no more wolf ammo) no more problems.