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I may have resolved it. I just cycled three clips (firing pin not installed) with no troubles. Previously, I had the firing pin and signal pin out, and it would still jam
So I polished the radius of the chamber in case there were burs or an edge. Then I tried again. Still jammed.
I removed the extractor again and inspected it. It was still sharp on the bottom. In fact the extractor was concave on the edge. So I rounded that lower corner, sanded, and polished the whole edge again. Seems OK now
Will range test on Wednesday
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