High Quality Content by WIKIPEDIA articles! The Hispano-Suiza HS.404 was an autocannon widely used as both an aircraft and land weapon in the 20th century by British, American, French, the Swiss Army and numerous other military services. Firing a 20 mm caliber projectile, it delivered a useful load of explosive from a relatively light weapon. This made it an ideal aircraft weapon, replacing the multiple 7.62 mm machine guns commonly used in military aircraft in the 1930s.

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