Hey Franny, Thanks for your input. I had never heard of this but thought for safety of it all I had better double check.
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I spent a few minutes and can't seem to find a 20 inch minimum recommended length like I seem to recall.
A local guy I know has that full skip stuff on I am guessing a 60cc Stihl with normal type length bar and calls it speed chain. My experience with it is limited, I hit some buried metal broke a tooth on the side that had less and finished the loop off flush cutting stumps.