Expert Jonathan Ferguson, Keeper of Firearms & Artillery at the Royal Armouries, details the Hispano 20mm Cannon Mk.II, a pivotal WWII aircraft weapon. He covers its design, integration challenges in aircraft like the Spitfire, technical specifications including its 106 lb weight and 650-750 RPM rate of fire, and the evolution from problematic drum magazines to reliable belt-feed systems. The explanation highlights its gas-unlocked blowback operation and unique pneumatic firing mechanism.
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