Breech mechanisms, e.g. locks

Child Classifications

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• F41A 3/02 Block action, i.e. the main breech opening movement being transverse to the barrel axis
• F41A 3/12 Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
• F41A 3/58 Breakdown breech mechanisms, e.g. for shotguns
• F41A 3/60 Breech mechanisms for guns having two or more barrels (F41A3/58 takes precedence; for revolving-cannon guns F41F1/10)
• F41A 3/62 using combustion gas pressure for adding to the mechanical locking action, or for delaying breech opening movement
• F41A 3/64 Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings