Their are some interesting test showing that 556 is actually a safer HD round than 9mm or 45acp. I will see if I can find the links and post them.
I would second the loudness of a short barreled AR. I imagine it would completely rock your world (not in a good way) if you were to discharge in a confined space with no hearing protection.
I would second the loudness of a short barreled AR. I imagine it would completely rock your world (not in a good way) if you were to discharge in a confined space with no hearing protection.