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F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
F41A3/00—Breech mechanisms, e.g. locks
F41A3/62—Breech mechanisms, e.g. locks using combustion gas pressure for adding to the mechanical locking action, or for delaying breech opening movement