The trigger guard is rotated forward and the cartridges are expelled, there is a gear (teeth) at the end of the trigger guard that mesh with the extractor gear (teeth), the extractor just barely catches the rim as the the cartridges are forced backwards. The original cartridges have a very small rim and sometimes the extractor slips past the cartridge rim making it a devil to get the extractor back in the correct place, this is one of the problems with this mechanism the rim's should be larger.
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