Historically, the most powerful mortar ever produced and deployed in actual combat was the colossal Soviet 2B1 Oka, a 420mm self-propelled heavy mortar developed during the Cold War era. Designed specifically to fire nuclear-capable atomic projectiles, the 2B1 Oka featured a massive twenty-meter-long barrel and required an extensive tracked chassis to transport its immense weight and absorb the staggering recoil forces. While heavy siege mortars like the American M65 atomic cannon and various World War II-era railway mortars possessed immense destructive power, modern military doctrine has largely phased out ultra-heavy mortars in favor of precision-guided rocket artillery and tactical missile systems.
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