I am thinking very seriously about trying the 80% route and have a couple of questions. First of which is why would I need to Anodize the lower? Is it a corrosion issue? I think the silver look is kind of cool. Anybody on here done this? I am looking at Colfax's jig over the others (CNC and TacticalMachine) for one simple reason. Colfax Tactical 80% AR-15 Lower Receiver Jig CNCGUNSMITHING - www.cncguns.com - AR15 80% Tooling / Drill Jig It has the drilling pattern on the top plate for use in a home drill press setting, like the TacticalMachine one does too, but it completely encases the lower forging allowing it to be clamped level without the mag well protruding out the bottom. Any other's out there I have not found yet? I know it is not that much of a price break doing this, if any. So save the "Cost/Work" argument. It is just pretty freakin cool to be able to legally do this and have one I said I finished.