Septic HISS, turret from Slaughter's Marauder's tank

Be honest, HISS guns are pretty weak. Compare caliber to the Mauler or Mobat...firepower is no place to be cheap. Let your HISS upgrade be heard far and away...super-size or up-gun...or go home. paladin features larger gun with no vulnerable exposed crew positions. It uses a standard HISS chassis with the option of adding a protected canopy for close quarters scenarios. Paint it black and light up the night.