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#semi-automatic #automatic weapon #loading mechanism #self-loading #breechblock

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#breechblock #firearm mechanism #gun lock #bolt assembly #action lock

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#breechblock #rotating bolt #gun locking lugs #bolt action lock #firearm breech

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#breechblock #sliding block #gun bolt #firearm action #bolt carrier group

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#breechblock #firearm rear block #gun breech seal #cartridge base support