I strongly suggest the 9"-13" Harris with notched legs. If it's only bench shooting, you can get away without the swiveling feature. If you're shooting in the field with it (prone) on uneven ground sometimes, do yourself a massive favor and get the swiveling version. I learned the hard way, now both of my Harris bipods are swiveling models. I only use bipods when shooting varmints, prone. (gophers out west, groundhogs here in Ontario, etc.)