I've tried many bi-pods. I always come back to the harris. The last one I bought was a Harris BRMS (bench rest swivel base) has 6-9" spring loaded notched legs and...of course a lockable swiveling base...Best one I've ever had, even being a BR model the length is perfect, very compact. Off a bench, prone, sitting with it on a rock or log, perfect length.
Harris BRMS on my Mod O