The Type 5211 is the main armament of larger Imperial Navy warships, most notably its Battleships.
The Type 5211 is a very heavy gun considering its caliber. Its bore depth is 60 calibers (12 inches x 60). The gun operates off a very large version of the falling block breech on the 24-Pounder Field Gun. The barrel of the gun is very thick because of the power of the firing charge. The shell is also very heavy, designed to pierce the armor of an enemy vessel and then explode within it.