. "8.7231816E7" . . "6\"/50 caliber gun" . . . . . . "16-inch/45-caliber Mark 6 gun" . . "16\"/45 caliber Mark 6 gun" . "16-inch/45-caliber Mark 6 gun" . . "18.5928" . . . . . . "6-inch/47-caliber Mark 16" . .