Understanding the Four Fundamental Operating Systems of Automatic Firearms

An educational diagram illustrating four types of firearm operating mechanisms: blowback, blowforward, recoil, and gas operation. Each section shows labeled parts like receiver, bolt, mainspring, barrel, and arrows indicating pressure and inertia directions during firing. The text labels include 'Blowback Operation', 'Blowforward Operation', 'Recoil Operation', and 'Gas Operation'.

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