What You Need to Know: The 16-inch/50-caliber Mark 7 gun, featured on Iowa-class battleships, became one of the U.S. Navy's most powerful and iconic weapons. Designed initially for lighter rounds, the Mark 7 was reengineered to fire a 2,700-pound Armor Piercing (AP) Mark 8 shell, rivaling the destructive capacity of larger Japanese guns.
-Mounted in turrets requiring 77 crew members, each Mark 7 could penetrate 32 feet of concrete or create massive craters with High Capacity shells.
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