Mechanisms or systems operated by propellant charge energy for automatically opening the lock

Child Classifications

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• F41A 5/02 recoil-operated
• F41A 5/18 gas-operated
• F41A 5/30 Gas- or recoil-operated, e.g. selection of gas- or recoil-operated systems
• F41A 5/32 Energy accumulator systems, i.e. systems for opening the breech-block by energy accumulated during barrel or gas piston recoil