That's it. I found some real good step by step instructions on the internet. That and a mill-drill gets me there. It takes me about 8 to 10 hours to to do an 80% and about twice that to do a raw forging.
Here are a couple interesting numbers. A raw forging weights 1 lb. 9 oz. (25 ounces). A fully machined receiver weights 8.2 ounces. Two thirds of the metal is removed. A typical 80% receiver weights 12.2 ounces as received.
One more thing. The price of raw forgings has gone from $30 in November to $80 currently when they have them.
Last edited by SAnd; 02-12-2013 at 09:41. Reason: typos
I wouldn't attempt a raw forging without a mill or mill/drill. I'm not saying it couldn't be done but I know I need a mill to do it. I can't be accurate enough without a machine guilding my hand.
There are fixtures (or jigs for the non politically-correct inclined) to complete the 80% lowers without a mill.
Here is a thread in the "Build Your Own" forum by some folks wanting to complete some 80% lowers-
http://www.ar-15.co/threads/80983-An...ng-an-80-lower
Here is a link to the instructions I use. It will give you an idea of what is involved in machining a lower -
http://www.lecreg.com/P4x4/ARblank.pdf
Have fun.