I like the idea of expanding the arsenal, but it should fit the theme of Bully.
For "guns", the bb gun and spud gun were as far as things really made sense to have. And later you couldn't even have the bb gun without mods.
But to have what would be seen as a lethal weapon is pointless since Bully was never coded to kill anyone in the first place. They only get knocked out and fall over rolling around.
I thought it would be nice to have a paintball gun though.