The Japanese 40 cm/45 Type 94 naval gun (四五口径九四式四〇糎砲 Yonjūgo-kōkei kyūyon-shiki yonjussenchi-hō) was the largest bore gun ever mounted on any warship. They were actually 46 cm (18.1 in) guns but were designated 40 cm (15.7 in) in an effort to hide their true size.
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