There have been some stupid low prices on lowers lately. I'm still leaning towards the polymer lowers because I'm pretty handy with a dremel. I have ni interest in .223 so If the polymer lowers can stand up to 9mm and maybe 7.62x39 then I can see having a couple of them to build on at a later date. I'm sure sure the metal lowers are better quality but I'm not trying to build any teotwawki rifles. I also cant really see putting any money into jigs and milling equipment.