Julius Avery on the personal story that inspired the film
The writer/director talks about how his own father's death when he was six and a troubled youth led to making "Son of a Gun" as well as how Perth changed its gun laws just for the production and how the crazier moments in the film were the most true to reality:
http://moveablefest.com/moveable_fest/2015/01/julius-avery-son-of-a-gu n.html