Usually blow back autos will eject without need for an extractor...maybe try firing a round with the extractor removed?
Did you try a known good extractor? perhaps the existing extractor was modified in some way for 7.62mm...
and the alternate question is, did you polish the chamber? perhaps there is a burr at the bottom of the chamber or throat...
How much shorter is that receiver tube than a Mk7 ? maybe there isn't enough travel for the bolt?Information
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