It would seem that the rear of the breech block is catching the front edge of the ejector, and bending/breaking it on the rearward stroke. It may require some fitting to the ejector to get it to clear the slot in the breech block correctly. I would disassemble the breech block from the toggle train, and see how it slides past the ejector by itself. Try to see how it is getting caught up and bent. There should be a slight amount of spring travel to the ejector as the breech block slides past, but it shouldn't be catching on anything.
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