I live in a suburb where it is illegal to discharge firearms,
That was your choice don't try to shove it off on anyone else.
He made the choice to move to an area that allowed shooting, now a neighbor doesn't like it, to damn bad.
That said he had better make sure that the berm is sufficient to stop any strays, that's his only responsibility to anyone else.
You can tell by Misty's story that she's pissed off about the noise mostly and just using the safety aspect as an excuse. Anyone who doesn't get that is a dunce.
