The Gustav Gun, (properly known as the Schwerer Gustav gun), was a siege gun developed in preparation for World War 2 and is the largest caliber rifled weapon to see combat in the history of artillery. The Gustav is also notable for firing the heaviest shell of any artillery piece. The only guns to exceed the Gustav in caliber are the British Mallet’s Mortar (36 inches/944mm) and the Fench Monster Mortar (36 French inches, 975 mm).
It was big so it was vulnerable to bombings without AA defenses. (PPPPPLLLLLZZZZZZ GAIJIN PLZ PLZ PLZ ADD THIS AS A MAP LIKE COD WW2 PLZ PLZ PLZ)