I haven't seen many complaints about extraction for the B22s, but quite a bit about MKIIs. Did you read my reply to you on RFC? All that talk you mention seemed to be about the MKs I believe. There is a vid on YT about the 'cocking piece' on the B22s that Miles Sun first made a couple years ago that is a good tip to avoid problems with wear of that piece. Maybe that's what you're thinking of ?
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