Diagram from DeHaas, Frank, Single Shot Rifles and Actions, DBI Books, 1969
Hammer in mid-position, on half-cock, locking the breechblock.
Photos courtesy Rock Island Auction Co
Rolling Block - A type of action, normally confined to 19th century single shot rifles, especially by Remington, where cocking the hammer releases a hinged breechblock to be swung back easily and to expose the chamber. When the hammer moves forward, its underlying cam locks the hinged breechblock in battery just prior to discharge.
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