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I'm a little confused by the wording of your post. First off, let me
make sure that I know what model of Rolling Block you have. Does
your rifle have the octagon section of barrel over the chamber area
(sometimes referred to as a knocksform) stamped with "Modelo
Argentino 1879 E. N."? If so, that model has a 'type 4' frame and
uses a rotary extractor.