A 4.5" rifled Rodman gun! Designed by Union artilleryman Thomas Jackson Rodman (1815-1871) primarily for installation at America's seacoast defenses, Rodman guns were less prone to bursting than older guns because they were manufactured in a revolutionary way that allowed the metal from which the cannon was cast to cool from the inside as opposed to the outside, which made for a stronger gun that made its crew not have to wince in such a noticable fashion every time they fired it, as Rodmans were known to not inadvertantly explode as frequently as older guns. Yes, technology. It's what made America great.