I made one out of scrap plywood and a 3/8ths dowel. It worked just fine until I turned down a second dowel for my .22's and put the 6 inch Ruger Single Six on it and the weight of the gun broke the dowel. The question, I see some are made from metal. Is there any concern about the metal dowel harming the inside of the barrel? Why are the pics horizontal and not vertical?