[ithacaartist]

My take on this is that the extractor must be pounding the insides of its slot laterally--in both directions-- in order to displace material up like this. Unfortunately, there's no discernible way--to me, anyway--for this to happen. The pic shows extra space, both behind the extractor's ears and its tail. One possibility is that, if it's a repro breech block, the slot profile was cut too far back, though how this setup could pound things sideways, as I said, is beyond me at this point!