Hey guys. Millling a lower is a reasonable amount of work. I programmed and built the lower that A-Rok posted earlier and am pleased with the results. Manually finishing a rough lower is quite a task. Not so much for someone with unlimited access to milling machines and components thereof but still involved. I decided to go billet 6160 for my lower and found that three weeks of programming toolpaths payed off. However, don't be discouraged for machining lowers. Time and patient calculation make all the difference when setting up a machine to pump out some accuracy for you, which ultimately translates to safety for us all in this deal!