Thanks guys, no I strictly only put 8 rounds in.
I opened them up and they're absolutely filthy inside, it looks as though the previous owner had put CRC or something in there that has attracted dirt.
I am going to clean them thoroughly and reassemble, and play around with the tabs.
It's the mag on the right of all 4 photos that is misfeeding terribly.
The other one only jammed once or twice out of 50 odd rounds.
Will have a play today and test fire them tomorrow when I can go out to the farm or range
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