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US patent 376576 is a unique combination of features seen in contemporary designs. This action goes well beyond similar work and showcases one of Browning’s great engineering strengths, efficiency. He uses complex interactions and unique arrangements to allow for a minimal number of parts.
This action is based on a combined breech-block and lever that are made as one integral piece. It employs a extractor assembly which supports the breech-block by sliding upon the lower surface of the ejection port. An unusual lever link causes the lever to move downward and rearward when rotated. This movement allows the action to be compact for the size of its cartridge.
Inventor: John Browning, Matthew Browning
Patent Attorney: John Earle
Assigned: Winchester, November 1887