Avoid power struggles. Make sure there are times when he gets to have the power. Make clear rules. They need to know who's in charge. Fairness is very important to boys.
Boys are like cows.
The bigger they get the more pasture they require. But they still need fences. There's a natural tendency to meet aggression with aggession. This contributes to why both parents physically punish boys more than girls. Be careful not to make guns a forbidden fruit.