James, A hammer block is similar to a firing pin block. It is a latch, block or other obstruction built into the action and normally positioned to prevent the hammer contacting the cartridge primer or firing pin when at rest. Video - youtube.com/watch?v=d
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Anonymous
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James, the reference is to a hammer-mounted firing pin. The hammer block is evidenced by a slot milled through the rear surface of the hammer beneath the spur, and a "tab" on the block is visible riding up and down in the slot. In short it is "old school"
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Anonymous
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The Pietta 1873 Single Action Revolver now comes with the transfer bar option. You might want to look into that.
