Just a feeler,how many builders would go from a 383 aluminum high pressure die cast clamshell AR lower with all the heavy work done, could be finished wit drill press and hand tools, standard ar lower parts would fit, and all standar uppers too, what do you think these unfinished lowers should sell for?, currently working on this tool project, test receivers have bee made and tested extensively, but now working on marketing and secondary operations, I will have some pictures soon, e mail if interested, remember these are high strength aluminum alloy castings, not folded and rivetedtin, or cheap cast pot metal, they have detail far beyond a forging or investment casting