>>1401477This.
Even if they don't work, giant guns like that will pretty much tell speed boat pirates to fuck off. But, they are cheeky fearless bastards who are betting they are defanged and ammo-less so who knows. You are probably better off having deranged cannons that can aim at something, but not fire. Then crew up with the best 50cal sniper rifles and assault rifles as you can legally do. I mean shit, real cannons take a pretty large amount of people to make them work unless you are mounting a howitzer and then they are only good against large slow moving targets, not speed boats which are the mainstay of pirates now.