You are mostly half right. Series 7 saw some serious changes during the run. Early to middle Series 7 are considered transitional rifles while late series 7 have many last ditch features.
They did produce several more series. They did not produce series 9 but off the top of my head I think they did make 10, 11 and 12.
Series 8, 10-12 are really rough including the rifles with a hole drilled through the butt for a rope sling.
They did produce several more series. They did not produce series 9 but off the top of my head I think they did make 10, 11 and 12.
Series 8, 10-12 are really rough including the rifles with a hole drilled through the butt for a rope sling.

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